[Sheet 1] Map showing extent of alluvial valley floors and overburden thickness above the Watkins lignite seam, Adams and Arapahoe Counties, Colorado -- [Sheet 2] Isopach map of the Watkins lignite seam, Adams and Arapahoe Counties, Colorado.
Photocopy; blue line print.
No collective title given on either sheet.
"This is a preliminary map subject to revision and is a part of U.S.G.S. Grant 14-08-0001-G-487, a study of the environmental impact of energy resource development in the Denver Basin."
Description based on print version record.
