TY  - RPRT
TI  - Remote sensing and airborne geophysics in the assessment of natural aggregate resources
AU  - D. H. Knepper
AU  - W. H. Langer
AU  - S.H. Miller
PY  - 1994
DO  - 10.3133/ofr94158
UR  - https://pubs.usgs.gov/publication/ofr94158
ID  - ofr94158
ER  -