Data on national employment for individual occupations and for selected industries are compiled. Short descriptions of the data sources are also given. Sections are titled (1) Occupational Data Based on Monthly Surveys of Households, (2) Occupation by Industry Statistics from Population Censuses, (3) Occupational Employment Data from Professional Societies, (4) Occupational Employment Data from Surveys of Employers, (5) Occupational Employment Data from Federal Regulatory Agencies, (6) Occupational Employment Data from the Federal Government, (7) Occupational Data from Wage Surveys, and (8) Local Area Occupational Information. Twenty tables give national employment data as reported from these several sources. The appendix contains tabular data for national employment in 1960-65 which was derived from sources other than the decennial census. (EM)