By Spilhaus Athelstan   in Journal of Forestry

ISSN:0022-1201|67|1|8-10

Society of American Foresters‎(1969)‎

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By Spilhaus Athelstan   Snyder John P.   in Cartography and Geographic Information Science

ISSN:1545-0465|18|4|246-254

Cartography and Geographic Information Society‎(1991)‎

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