[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.
prepared for the Division of Disaster Emergency Services, Department of Public Safety; by the Flood Control and Floodplain Management Section, Colorado Water Conservation Board, Department of Natural Resources., "Spring 1989.", Online resource; title from PDF cover (viewed October 2017)
prepared by the Colorado Water Availability Task Force; Impact Task Forces ; presented by the Colorado Water Availability Task Force; Review and Reporting Task Force., "April 14, 2003.", Online resource; title from PDF cover (viewed April 2016)