TY  - RPRT
TI  - Digital data for construction material sources reported by the Arizona Department of Transportation in 1977 for Maricopa County, Arizona
AU  - Douglas M. Hirschberg
AU  - G. Stephen Pitts
AU  - Henry L. Melcher
AU  - James D. Bliss
PY  - 2001
DO  - 10.3133/ofr01122
UR  - https://pubs.usgs.gov/publication/ofr01122
ID  - ofr01122
ER  -