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john h ohman
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Black bark as an indicator of bird peck defect in sugar maple
John H. Ohman · Lake States Forest Experiment Station, Forest Service, U.S. Department of Agriculture
Sayfa sayısı yok · 1964
Sugar maple / Diseases and pests / Bird pests
Current status of the sapstreak disease of sugar maple in the Lake States
John H. Ohman · Lake States Forest Experiment Station, U.S. Dept. of Agriculture
Sayfa sayısı yok · 1963
Sugar maple / Diseases and pests / Fungal diseases of plants
Decay and discoloration of sugar maple
John H. Ohman · U.S. Govt. Print. Off.]
Sayfa sayısı yok · 1968
Sugar maple / Wounds and injuries / Acer saccharum / Trees / Decay