 | Grasham, John L. | (1) |
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 | Grasham, John L.; Preparative techniques and tissue-selection criteria for in vitro culture of healthy and rust-infected conifer tissues / J.L. Grasham and A.E. Harvey. Ogden, Utah : Intermountain Forest & Range Experiment Station, Forest Service, U.S. Dept. of Agriculture, 1970. | |
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