By Billings C. L.   in Journal of Forestry

ISSN:0022-1201|44|11|824-826

Society of American Foresters‎(1946)‎

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By Billings C. L.   in Journal of Forestry

ISSN:0022-1201|42|9|645-646

Society of American Foresters‎(1944)‎

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By Billings C. L.   in Journal of Forestry

ISSN:0022-1201|35|2|134-137

Society of American Foresters‎(1937)‎

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By Billings C. L.   in Journal of Forestry

ISSN:0022-1201|26|2|189-193

Society of American Foresters‎(1928)‎

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By Billings C. L.   Rettig E. C.   Baggs John T.   Rapraeger E. F.   in Journal of Forestry

ISSN:0022-1201|40|5|364-370

Society of American Foresters‎(1942)‎

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