By Shepard Robert K.   in Journal of Forestry

ISSN:0022-1201|73|7|420-423

Society of American Foresters‎(1975)‎

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By Shepard Robert K.   in Forest Science

ISSN:0015-749X|21|4|370-372

Society of American Foresters‎(1975)‎

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By Shepard Robert K.   in Southern Journal of Applied Forestry

ISSN:0148-4419|2|3|83-85

Society of American Foresters‎(1978)‎

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