TY  - RPRT
TI  - Specification aggregate quarry expansion - A case study demonstrating sustainable management of natural aggregate resources
AU  - William H. Langer
AU  - M. L. Tucker
PY  - 2003
DO  - 10.3133/ofr03121
UR  - https://pubs.usgs.gov/publication/ofr03121
ID  - ofr03121
ER  -