Cover title.
Plate 1: Tri-towns subsidence investigation, Weld County, Colorado, mining features (scale 1:4,800); Plate 2: Tri-towns subsidence investigation, Weld County, Colorado, subsidence evaluation and hazard classification (scale 1:4,800); Plate 3: Tri-towns subsidence investigation, Weld County, Colorado, representative cross-sections.
Includes bibliographical references (p. 49-52).
"This study was funded by U.S. Government Grant No. G5127081."
