Hail, William J. Jr.; Geology of Northwestern North Park, Colorado: a Study of the Stratigraphy and Areal Geology of Part of the North Park Basin Jackson County, Colorado. USGS Bull. 1188, 1965. & Geology of southwestern North Park and vicinity, Colorado. USGS Bull. 1257, 1968. Octavo, text, pp. v, 133, 5 folded geological maps in pocket, 15 text figures, 1 table. & pp. v, 119, 3 folded geological map in pocket, 8 text figures, 4 tables.
Both works are complete and both are in the original slipcases with maps in pocket. The bindings and cases are tight and clean, the maps are all fine, owner’s small stamp on each case and title page. In very good condition.
Hail provides a detailed description of the geography, stratigraphy, structural geology, and mineral resources of western Jackson County, located in northwestern Colorado.