Iowa State University Veterinarian Records, RS 22/6/0/9, University Archives, Special Collections Department, Iowa State University, http://www.add.lib.iastate.edu/spcl/arch/rgrp/22-6-0-9.html
During the past decade, the turkey industry has become an important branch of the livestock industry. The number of turkeys raised in the United States during 1945 was approximately 45,000,000 and the crop in 1946 will be almost as large. When this number is compared with the number of turkeys (3,000,000) raised in the United States in 1920, the increase is phenomenal. The turkey industry has grown from a minor farm enterprise to big business. A few years ago the average size flock was a few hundred. Now it is not uncommon to see flocks of several thousand. During the past year Iowa raised as many turkeys as the entire United States produced in 1920.
Pomeroy, Benjamin S. and Fenstermacher, R.
"Diseases Of Turkeys,"
Iowa State University Veterinarian: Vol. 9
, Article 3.
Available at: http://lib.dr.iastate.edu/iowastate_veterinarian/vol9/iss1/3