TY  - RPRT
TI  - Revisions of Ulmus and Zelkova in the middle and late Tertiary of western North America
AU  - Toshimasa Tanai
AU  - Jack A. Wolfe
PY  - 1977
DO  - 10.3133/pp1026
UR  - https://pubs.usgs.gov/publication/pp1026
ID  - pp1026
ER  -