TY  - RPRT
TI  - Aerial gamma-ray color contour maps of regional surface concentrations of potassium, uranium, thorium and composite-color maps of uranium, potassium, thorium, and their ratios in New Mexico
AU  - J. S. Duval
PY  - 1989
DO  - 10.3133/gp980
UR  - https://pubs.usgs.gov/publication/gp980
ID  - gp980
ER  -