Originally published as: Geology and ground-water resources of the Swan Lake-Yonna Valleys area, Klamath County, Oregon (Portland, Oregon : U.S. Geological Survey, 1952) Digital reproduction of item held by Oregon Institute of Technology Library: https://alliance-primo.hosted.exlibrisgroup.com/primo-explore/search?tab=default&search_scope=oit_alma&vid=OIT&institution=OIT&mode=basic&query=any,contains,11169127