Protection our country's potato crop how seed potato certification scbeme works
Humphreys, J.R.
Protection our country's potato crop how seed potato certification scbeme works - Salisbury 1940 - 1-4 p. - Crop, Potato Federal Ministry of Agriculture. Bulletin No. 2174 .
Protection our country's potato crop how seed potato certification scbeme works - Salisbury 1940 - 1-4 p. - Crop, Potato Federal Ministry of Agriculture. Bulletin No. 2174 .