 | Hardwoods United States. | (2) |
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 | Even-aged silviculture for upland central hardwoods / by Benjamin A. Roach and Samuel F. Gingrich. Roach, Benjamin A. (Benjamin Arthur), 1924- 4n Washington, D.C. : U.S. Dept. of Agriculture, Forest Service, 1968. | |
| The northern hardwood forest : its composition, growth, and management / by E.H. Frothingham. Frothingham, E. H. (Earl Hazeltine), 1880- 4n Washington, D.C. : U.S. Dept. of Agriculture, 1915. | |
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