Swine sanitationde M. C. WilsonMateriasCounty agricultural agentsAgricultural extension workersSwineEdiciones (1)Swine sanitation (1926)Extension Service, U.S. Dept. of Agriculture · inglésMás obras de M. C. WilsonHow and to what extent is the Extension Service reaching low-income farm familiesExtension activities and accomplishments, 1940Statistical results of cooperative extension work, 1924