TY  - RPRT
TI  - Using geographic information systems with specific examples for the aggregate industry
AU  - Roger Melik
AU  - T.L. Furman
AU  - W. H. Langer
AU  - H. Van Brenk
PY  - 1998
DO  - 10.3133/ofr9839
UR  - https://pubs.usgs.gov/publication/ofr9839
ID  - ofr9839
ER  -