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Jan van Wagtendonk and Harold Biswell in 1970

Detailed Description

NPS scientist emeritus and former USGS scientist Jan van Wagtendonk sits against a ponderosa pine with mentor Harold Biswell near a prescribed fire in 1970, in Yosemite National Park.

Van Wagtendonk's dissertation work on prescribed fire in Yosemite around this time led to prescribed burning guidelines still in use in Yosemite today, and a long career in forest and fire science with the federal government.


Public Domain.