TY  - RPRT
TI  - Gravel resources, urbanization, and future land use, Front Range Urban Corridor, Colorado
AU  - James M. Soule
AU  - Harold R. Fitch
PY  - 1974
DO  - 10.3133/ofr74178
UR  - https://pubs.usgs.gov/publication/ofr74178
ID  - ofr74178
ER  -