Swingle, C.F. 1939. Seed propagation of trees, shrubs and forbs for conservation planting. SCS-TP-27. Washington, DC: U.S. Department of Agriculture, Soil Conservation Service. 198 p.

Swingle, C.F. 1939. Seed propagation of trees, shrubs and forbs for conservation planting. SCS-TP-27. Washington, DC: U.S. Department of Agriculture, Soil Conservation Service. 198 p.

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