North Dakota Agricultural College. Agricultural Extension Service. (1935). Circular. Agricultural Extension Service, North Dakota Agricultural College.
Lua i Stíl Chicago (17ú heag.)North Dakota Agricultural College. Agricultural Extension Service. Circular. Fargo, N.D.: Agricultural Extension Service, North Dakota Agricultural College, 1935.
Lua MLA (8ú heag.)North Dakota Agricultural College. Agricultural Extension Service. Circular. Agricultural Extension Service, North Dakota Agricultural College, 1935.
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