APA (7th ed.) Citation

Geological Survey (U.S.) & Sandberg, D. T. (1986). 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. The Survey.

Chicago Style (17th ed.) Citation

Geological Survey (U.S.) and Dorothy T. Sandberg. 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. Reston, Va.: The Survey, 1986.

MLA (9th ed.) Citation

Geological Survey (U.S.) and Dorothy T. Sandberg. 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. The Survey, 1986.