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From the text ... 'The ponderosa pine-grassland is characterized by the occurrence and distribution of ponderosa pine, Pinus ponderosa. It is widely spread covering some 36 million acres from the Fraser River Basin in British Columbia to Durango,...

Person: Biswell
Year: 1973
Type: Document
Source: TTRS

A record of prehistoric and historic burning of carbonaceous materials may be found in the elemental carbon contents of the sedimentary columns. The widespread dissemination of such carbon as microcrystalline graphite is indicated by its presence in...

Person: Smith, Griffin, Goldberg
Year: 1973
Type: Document
Source: FRAMES, TTRS