Books by J. H. Gourley
A survey of Ohio orchard soils
A survey of Ohio orchard soils relative to phosphorus distribution and acidity
Nitrate fertilization and keep
Nitrate fertilization and keeping quality of apple fruits
Chemical fertilizers for green
Chemical fertilizers for greenhouse lettuce
Ringing applied to the commerc
Ringing applied to the commercial orchard
Manures and fertilizers for tr
Manures and fertilizers for truck crops
Text-book of pomology
Notes on the presence of nitrates in orchard soils
The effects of fertilizers in
The effects of fertilizers in a cultivated orchard
... Orchard management