 | Roe, Arthur L. (Arthur Lawrence), 1909- 4n | (1) |
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 | Roe, Arthur L. (Arthur Lawrence), 1909- 4n; Engelmann spruce regeneration practices in the Rocky Mountains / Arthur L. Roe, Robert R. Alexander, Milton D. Andrews. : U.S. Dept. of Agriculture, Forest Service, 1970. | |
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