1. Additions to the flora of the Spotted Ridge Formation in central Oregon Author/Creator: Mamay, Sergius H., 1920- author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1956 Resource Type: Book Access & Availability: Loading
2. Additions to the flora of the Spotted Ridge Formation in central Oregon, Author/Creator: Mamay, Sergius H., 1920- Publication/Creation: Washington : U.S. Govt. Print. Off, 1956 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 274. Access & Availability: Loading