This publication is the third of four volumes of "Tomorrow's Manpower Needs," which are devoted to the subject of national, state, and area projections of manpower requirements. This volume presents information on the national employment trends and projected 1975 requirements for workers in nine major occupational groups and 40 selected occupations. The nine major occupational groups are (1) professional, technical, and kindred workers, (2) managers, officials, and proprietors, (3) clerical and kindred workers, (4) sales workers, (5) craftsman, foreman, and other skilled workers, (6) semi-skilled workers (operatives), (7) laborers, (8) service workers, and (9) farm workers. The occupational statements include a discussion of past employment trends, the economic and technological factors expected to influence occupational requirements through the mid 1970's, and ways workers become qualified for the occupation. Related publications are available as VT 008 727-VT 008 730. (CH)