 | Trees United States. | (3) |
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 | Check list of native and naturalized trees of the United States (including Alaska) / by Elbert L. Little, Jr. Little, Elbert Luther, 1907- 2n Washington, D.C. : Forest Service, 1953. | |
| Silvics of forest trees of the United States / prepared by the Division of Timber Management Research, Forest Service ; compiled and rev. by H.A. Fowells. Washington, D.C. : U.S. Dept. of Agriculture, Forest Service, 1965. | |
| Trees. Washington, D.C. : U.S. Dept. of Agriculture, 1949. | |
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