Cornell University has digitized the contents of the Census of Agriculture from 1840 to 2002. IPUMS NHGIS has data from 1840-1950.
Fifteenth census of the United States, 1930. Agriculture / prepared under the supervision of William Lane Austin.
v. 1. Farm acreage and farm values by townships or other minor civil divisions.--v. 2. Reports by states, with statistics for counties and a summary for the United States. pt. 1. The Northern states. pt. 2. The Southern states. pt. 3. The Western states.--v. 3. Type of farm. Reports by states, with statistics for counties and a summary for the United States. pt. 1. The Northern states. pt. 2. The Southern states. pt. 3. The Western states.--v. 4. General report, statistics by subjects.
Washington : U.S. G.P.O. : For sale by the Supt. of Docs., 1931-1932.
HD1753 1930q (DOCSC) Decennial Census - Firestone Library
Fifteenth census of the United States: 1930. Outlying territories and possessions. Number and distribution of inhabitants. Composition and characteristics of the population. Occupations, Unemployment and Agriculture. Prepared under the supervision of Starke M. Grogan, in charge of outlying territories and possessions.
Washington, U.S. Govt. print. off., 1932
Fifteenth census of the United States: 1930. Agriculture. Chickens and chicken eggs and turkeys, ducks, and geese raised on farms. Chickens and poultry products, with selected items by size of flock, for the United States, states, and counties, 1930 and 1929. Prepared under the supervision of William Lane Austin, chief statistician for agriculture
Washington, U.S. Govt. print. off., 1933.