Directions for treatment of insect pests and plant diseases
Lochhead, W.M.
Directions for treatment of insect pests and plant diseases - Toronto 1902 - 1-12 p. - Diseases, Plant Ortario Agricultural College. Bulletin No. 122 .
Directions for treatment of insect pests and plant diseases - Toronto 1902 - 1-12 p. - Diseases, Plant Ortario Agricultural College. Bulletin No. 122 .