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No. 805. MERCHANT VESSELS COMPLETED BY U.S. SHIPYARDS: 1930 To 1959 [Represents self-propelled steel vessels of 2,000 gross tons and over. Excludes Alaska and Hawaii]

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Source: American Bureau of Shipping, New York, N.Y.; published annually in The Bulletin.

No. 806. U.S. MERCHANT MARINE-NUMBER AND GROSS TONNAGE OF VESSELS, BY TONNAGE GROUPING: 1959

[As of January 1. Includes Alaska, Hawaii, Guam, Puerto Rico, and Virgin Islands. Covers documented vessels of 5 net tons or more]

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No. 807. U.S.

2 Less than 500 gross tons.

MERCHANT MARINE-NUMBER AND GROSS TONNAGE OF VEssels
BUILT, AND REMOVED: 1940 TO 1958

[Includes Alaska, Hawaii, Guam, Puerto Rico, and Virgin Islands. Covers documented vessels of 5 net tons or more. Vessels may be added to merchant marine by way of redocumentation. However, figures are available only for vessels documented. See also Historical Statistics, Colonial Times to 1957, series Q 178-182]

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2 Vessels having no propelling power of their own.

Less than 500 gross tons.

Beginning 1955, sold or transferred to aliens. Included in All other. Source of tables 806 and 807: Treasury Department, Bureau of Customs; annual report, Merchant Marine Statistics.

No. 808. U.S. MERCHANT MARINE SUMMARY: 1920 TO 1959

[As of June 30 for 1920 to 1940; January 1, thereafter. Includes Alaska, Hawaii, Guam, Puerto Rico, and Virgin Islands. Covers documented vessels of 5 net tons or more. See also Historical Statistics, Colonial Times to 1957, series Q 153-174]

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No. 809. U.S. MERCHANT MARINE-NUMBER AND GROSS TONNAGE OF VESSELS,

BY YEAR OF BUILD: 1959

[As of January 1. Includes Alaska, Hawaii, Guam, Puerto Rico, and Virgin Islands. Covers documented vessels of 5 net tons or more]

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Source of tables 808 and 809: Treasury Department, Bureau of Customs; annual report, Merchant Marine Statistics.

No. 810.

MERCHANT VESSELS LAUNCHED AND OWNED, FOR THE World and the
UNITED STATES: 1935 TO 1959

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Source: Lloyd's Register of Shipping, London; records.

No. 811. MERCHANT FLEETS OF THE WORLD-NUMBER AND AVERAGE AGE OF VESSELS, BY TYPE OF VESSEL AND COUNTRY OF REGISTRATION: 1958 [Vessels of 1,000 gross tons and over. As of December 31. Specified countries have 100 or more ships]

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1 Includes the following countries with less than 100 merchant type ships (1,000 gross tons and over) under their registry: Albania, Belgium, Burma, Bulgaria, Canada, Ceylon, Chile, Colombia, Cuba, Czechoslovakia, Dominican Republic, Ecuador, Ethiopia, East Germany, Ghana, Guatemala, Honduras, Hungary, Iceland, Indonesia, Ireland, Israel, Korea, Lebanon, Mexico, Monaco, Morocco, New Zealand, Nicaragua, Other Colonies (British Commonwealth), Pakistan, Peru, Philippines, Poland, Portugal, Rumania, Saudi Arabia, Switzerland, Thailand, Tunisia, Union of S. Africa, United Arab, Uruguay, Venezuela, Viet-Nam, Yugoslavia, and unknown. Source: Department of Commerce, Maritime Administration; A Statistical Analysis of the World's Merchant Fleets, December 1958.

Section 23

Irrigation, Drainage, and Soil Conservation

This section presents statistics concerning agricultural land development, in particular, measures of the activities of irrigation and drainage enterprises, and reclamation and land conservation projects. The primary sources for these data are the Bureau of the Census which conducts decennially a Census of Drainage and a Census of Irrigation (as part of the Census of Agriculture), and a mid-decade Census of Agriculture which covers fewer items in these fields; the Report of Administrator of Soil Conservation Service, issued by the Soil Conservation Service of the Department of Agriculture; Crop Report and Related Data, Federal Reclamation Projects, issued annually by the Bureau of Reclamation, Department of the Interior; and the Annual Report of the Commissioner of Reclamation to the Secretary of the Interior.

Irrigation. Irrigated land as defined by the Bureau of the Census is the net acreage of farm land to which irrigation water is applied. It does not include land that could be irrigated, or usually is irrigated, but was not irrigated during the census year. Excluded also is uncultivated land (roads, farmsteads) in irrigated farms and irrigated nonfarm land (cemeteries, parks, golf courses, etc.).

Most of the irrigated land is located in the 17 Western States (excluding Alaska and Hawaii) and Arkansas, Louisiana, and Florida. In these States the Bureau of the Census collects information on acres irrigated, irrigation works, capital investment, and a number of other items from irrigation companies, districts, and other organizations, and from farms that operate their own irrigation supply works. Information for the other States, excepting special surveys, is limited to that reported in the regular farm census.

The development of irrigation projects rests primarily on the Bureau of Reclamation. By Congressional directive its activities are confined to 18 Western States including Alaska. The operation of irrigation works, upon complete development, is transferred to capable private water user organizations.

Drainage. Most farm land drainage works serve to reclaim and improve the land. Other purposes are to protect the land against overflow, and to rid the land of seepage from irrigation ditches or for control of alkali formation.

The farm lands of the Eastern States need drainage to remove surplus rainfall. Most of this is gravity drainage, although pumps are sometimes used. In the Western States drainage serves to remove seepage water from irrigated lands and to carry off alkali salts.

The Bureau of the Census in 1950 enumerated, in general, only those organized enterprises with 500 acres or more of drained farm land. A few irrigation enterprises of smaller size which had their own drainage works were also included. In previous Censuses (1910 to 1940) all organized enterprises draining farm lands were included in the enumeration regardless of size. Privately drained lands of less than 500 acres have not been enumerated in any of the four drainage censuses. The change in Census procedure for 1950 materially reduced the number of enterprises enumerated, but affected very little the amount of drained land enumerated. Drainage enterprises in Alaska and Hawaii are not included in the statistics presented here.

In taking the 1950 Census, differences in form of organization and management of drainage enterprises made it necessary to divide arbitrarily the 40 States with drain

age enterprises into two groups: The 10 "county-drain" States and the 30 "drainagedistrict" States. The 8 States with no drainage enterprises in 1950 were the 6 New England States, Pennsylvania, and West Virginia. In the 10 "county-drain" States (Delaware, Indiana, Iowa, Kentucky, Michigan, Minnesota, North Dakota, Ohio, Oklahoma, South Dakota), statistics were gathered for the county as a unit, rather than for each separate enterprise as for the 30 "drainage-district" States. Generally, the maintenance work on existing ditches has been done by reorganizing the land of an earlier enterprise into a new project. Since the number of enterprises for “countydrain" States would be meaningless, the number was not obtained for these 10 States. In the Western States most of the drained land is located in irrigation enterprises which were chartered to do both irrigation and drainage work under one organization. The cost of construction, operation, and maintenance of the irrigation works is usually far greater than that for drainage. Separate records are seldom kept of expenditures for drainage and irrigation. Data were not included in the 1950 Census for cost, collections, and indebtedness of irrigation enterprises having their own drainage. Therefore, the data for 1950 are not fully comparable with those for earlier years. Soil conservation.-Basic soil conservation district legislation has now been enacted in all of the States (including Alaska and Hawaii), and in Puerto Rico and the Virgin Islands. Each of these laws contains an effective date after which soil conservation districts could be organized by local farmers and operators. A soil conservation district is a political subdivision of a State which is determined by petition and referendum of farmers residing in the area, and approved by the State Soil Conservation Committee. Districts, in most cases, have authority to solicit Federal, State, county, and private assistance in carrying on their soil and water conservation program within the area. On request of the local governing body of each soil conservation district, the Department of Agriculture provides technical and other assistance to districts, through its several agencies. "Memorandums of understanding" form the basis on which any departmental assistance is provided to a district for use on the farms and ranches within the district. After the basic memorandum with the Department has been signed, the Soil Conservation Service signs a supplemental memorandum with each district governing body requesting assistance, to cover activities which the Soil Conservation Service will help each district to carry out.

Alaska and Hawaii.-For a general statement concerning the treatment of data for Alaska and Hawaii, see preface.

Historical statistics.-Tabular headnotes (as "See also Historical Statistics, Colonial Times to 1957, series J 84-85") provide cross-references, where applicable, to Historical Statistics of the United States, Colonial Times to 1957. See preface.

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