TY  - RPRT
TI  - No. 4: Synopsis of the flora of Colorado
AU  - Ferdinand Vandeveer Hayden
AU  - Thomas C. Porter
AU  - John M. Coulter
PY  - 1874
DO  - 10.3133/70038992
UR  - https://pubs.usgs.gov/publication/70038992
ID  - 70038992
ER  -