Extension research in the Republic of South Africa : summaries of research projects completed in the Department of Agrarian Extension of the University of Pretoria 1959-1972 /

Eitemau Tebyg

• Farming opportunities in the Union of South Africa /
  Cyhoeddwyd: (1922)
• Agricultural extension; farm extension services in Australia, Britain and the United States of America
  gan: Williams, D. B. (Donald Birtall), 1920-
  Cyhoeddwyd: (1968)
• Cooperative extension work /
  gan: Kelsey, Lincoln David, 1894-
  Cyhoeddwyd: (1949)
• Cooperative extension work /
  gan: Kelsey, Lincoln David, 1894-
  Cyhoeddwyd: (1963)
• Agricultural research.