The Forest Type Maps of Oregon document forest composition at the county, region, and statewide level in Oregon from 1900 to the mid-1950s. The maps were prepared by the U.S. Forest Service and the U.S. Geological Survey. The earliest maps (1900-1901) were published in color. The maps depict the type and quality of timber in a given area as well as non-forested and de-forested land.
The Oregon Timber Tax Maps consist of more than 4,000 maps and related documents detailing appraisal information for forest taxes. The collection includes annotated township maps, data sheets on timber volume, as well as many other pieces of information regarding the valuation of timbered lands in Oregon during the 1950s-1970s.