By Hall Ralph C.   in Journal of Forestry

ISSN:0022-1201|77|3|136-139

Society of American Foresters‎(1979)‎

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By Croizier Ralph C.   in Journal of Asian and African Studies

ISSN:0021-9096|7|3-4|265-266

Brill‎(1972)‎

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By KEPHART RALPH C.   in Journal of the American Society of Naval Engineers

ISSN:0099-7056|46|1|100-106

American Society of Naval Engineers‎(1934)‎

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By Hawley Ralph C.   in Journal of Forestry

ISSN:0022-1201|21|3|225-230

Society of American Foresters‎(1923)‎

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By Hawley Ralph C.   in Journal of Forestry

ISSN:0022-1201|22|3|275-281

Society of American Foresters‎(1924)‎

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By Bryant Ralph C.   in Journal of Forestry

ISSN:0022-1201|30|2|130-136

Society of American Foresters‎(1932)‎

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By Hawley Ralph C.   in Journal of Forestry

ISSN:0022-1201|18|7|681-692

Society of American Foresters‎(1920)‎

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By Hawley Ralph C.   in Journal of Forestry

ISSN:0022-1201|20|6|651-661

Society of American Foresters‎(1922)‎

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By Hall Ralph C.   in Journal of Forestry

ISSN:0022-1201|33|2|169-172

Society of American Foresters‎(1935)‎

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By Hawley Ralph C.   in Journal of Forestry

ISSN:0022-1201|23|3|245-250

Society of American Foresters‎(1925)‎

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