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Essays in natural history and agriculture
The health of our soils : toward sustainable agriculture in Canada
Report of the North Carolina geological survey. together with descriptions of the fossils of the marl beds Agriculture of the eastern counties
Scientific agriculture; or, The elements of chemistry, geology, botany and meteorology, applied to practical agriculture
Insects; the yearbook of agriculture,1952
Miscellaneous studies in agriculture and biology
Insects injurious to agriculture in Japan
A text-book of tropical agriculture
Announcement of correspondence courses in agriculture
Productive agriculture, by John H. Gehrs