 | Insect pests North America Bibliography. | (1) |
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 | Bibliography on insects destructive to flowers, cones, and seeds of North American conifers / by Dorothy R. Barcia, Edward P. Merkel. Barcia, Dorothy R. Asheville, N.C. : U.S. Dept. of Agriculture, Forest Service, Southeastern Forest Experiment Station, 1972. | |
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