Displaying 81 - 90 of 90
Kauffman, Martin
Numerous studies, historical accounts and archaeological evidence suggest that the historical density and abundance of black oak (Quercus kelloggii Newb.) in mixed conifer forests was much greater than today. Reasons for the decline of this species…
Type: Document
Year: 1987
Roberts
[no description entered]
Type: Document
Year: 1985
Buckner
The meaning of 'natural' as a guideline for managing public forests is questioned. Evidence of a rapidly shifting flora over eastern North America in recent geologic time is presented along with historical evidence of the open character of the…
Type: Document
Year: 1983
Keith
[no description entered]
Type: Document
Year: 1980
[no description entered]
Type: Document
Year: 1976
Wilhelm
From the Conclusions ... 'Prior to becoming a national park, Shenandoah had gone through periods of indiscriminate logging, hunting, livestock grazing, and burning. Then the area entered the National Park System and shifted abruptly to a regime of…
Type: Document
Year: 1973
Rostlund
[no description entered]
Type: Document
Year: 1960
Stewart
From the text...'The unrestricted burning of vegetation appears to be a universal culture trait among historic primitive peoples and therefore was probably employed by our remote ancestors. Archeology indicates that extensive areas of the Old and…
Type: Document
Year: 1956
Wells
[no description entered]
Type: Document
Year: 1938