1. Revisions of Ulmus and Zelkova in the Middle and Late Tertiary of western North America Author/Creator: Tanai, Toshimasa Publication/Creation: Washington : U.S. Govt. Print. Off, 1977 Resource Type: Book Is Part Of: U.S. Geological Survey professional paper, no. 1024-1030. Access & Availability: Loading
2. Revisions of Ulmus and Zelkova in the Middle and Late Tertiary of western North America Author/Creator: Tanai, Toshimasa, author Publication/Creation: Washington : United States Department of the Interior, Geological Survey, 1977 Resource Type: Book Access & Availability: Loading