CHAPIN, F. H. The Land of the Cliff Dwellers.[4] W. B. Clarke & Co.,
Boston, Mass. 1892. 187 pages.
DOUGLASS, DR. ANDREW ELLICOTT. The Secret of the Southwest Solved by
the Talkative Tree Rings, in National Geographic Magazine,
December 1929.[4]
FARIS, JOHN T. Roaming the Rockies. Farrar & Rinehart, Inc., New
York. 1930. Illustrated. 333 pages. Mesa Verde on pp. 193-203.