TY  - RPRT
TI  - Isopach map of interval between top of the Pictured Cliffs Sandstone and the Huerfanito Bentonite bed of the Lewis Shale, La Plata County, Colorado, and Rio Arriba and San Juan counties, New Mexico
AU  - D.T. Sandberg
PY  - 1986
DO  - 10.3133/mf1831
UR  - https://pubs.usgs.gov/publication/mf1831
ID  - mf1831
ER  -