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j fred hockey
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Agricultural research in the Annapolis Valley area, 1909-1960
J. Fred Hockey · Queen's Printer
41 sayfa · 1967
Agriculture / Canada / Canada. Experimental station, Kentville, N.S. / History / Research
Apple scab
J. Fred Hockey · Department of Agriculture
Sayfa sayısı yok · 1953
Diseases and pests / Apple scab / Apples
Making bordeaux mixture
J. Fred Hockey · Dept. of Agriculture
Sayfa sayısı yok · 1940
Spraying / Bordeaux mixture / Fongicides / Bouillie bordelaise