Fertilizers
Harcourt, R., Gibson, A.L.
Fertilizers In relation to soils and crop production - Toronto 1914 - 1-30 p. - Fertilizers, Soils Ontario Agricultural College. Bulletin No. 223 .
Fertilizers In relation to soils and crop production - Toronto 1914 - 1-30 p. - Fertilizers, Soils Ontario Agricultural College. Bulletin No. 223 .