TY  - RPRT
TI  - Earliest conifers in North America; upland and/or paleoclimatic indicators?
AU  - Paul C. Lyons
AU  - W.C. Darrah
PY  - 1989
DO  - 10.2307/3514592
UR  - https://pubs.usgs.gov/publication/70015380
ID  - 70015380
ER  -