1970 census of population : microfiche final reports : report 1-Alphabetical index of industries and occupations, report 2-Classified index of industries and occupations. Microfilm via UW Libraries
Thirteenth Census of U.S., Apr. 15, 1910. Instructions to enumerators, including supplemental instructions for collection of statistics of manufactures and of mines and quarries. Microfilm via UW Libraries
Census of distribution, manufactures, and mines and quarries, 1929 : instructions for preparing distribution, manufactures, and mines and quarries reports : cities having 10,000 or more inhabitants. Print copy via UW Libraries
Suzanne Schulze's guides to the population censuses are consulted frequently. Schulze's detailed guides allow users to read about the variables and coverage of each census volume before spending time in a fruitless quest.