visions were not made in the BLS data. The boundary changes in the four other SMSA's-Cleveland, San Francisco-Oakland, St. Louis, and Boston--affected only a small proportion of their populations.

(4) The BES unemployment definitions have not yet been adjusted for the changes in definition and coverage that were made by the BLS in January 1967.3/

3 "New Definitions for Employment and Unemployment," Employment and Earnings and Monthly Report on the Labor Force, BLS: February 1967.

and coverage account for part of the differences in labor force (or work force), unemployment, and unemployment rates in the SMSA's covered by both. Despite these differences, the ranking of areas according to unemployment rates remains essentially the same. For instances, a ranking of cities into those with high, medium, or low unemployment rates would be the same whether BES or BLS estimates were used. Although the BES estimates give only total figures with no demographic detail, they are available on a monthly basis for 150 major metropolitan areas, and areas, and on a less frequent basis for many smaller areas.