Vogelsang, Donald L, et al. "Cooperative Agrichemical and Seed Operations." ,
Vogelsang, D. L, Eversull, E. Eldon, Mather, J. Warren (James Warren), United States, U. States, & Agricultural Cooperative Service, A. Cooperative Service. (1990). Cooperative agrichemical and seed operations.
Vogelsang, Donald L., E. Eldon Eversull, J. Warren (James Warren) Mather, United States, and Agricultural Cooperative Service. "Cooperative agrichemical and seed operations" (1990):