Appreciation is extended to the United States Department of the Interior, Lic. Bernardo Biados, Barry & René Fell and various government agencies in the Americas for their assistance in accessing photographed sites. The sources of unidentified photos are being sought; please contact <firstname.lastname@example.org>
Further details about sites may be found in:
Heizer, R. F. & M. A. Baumhoff. 1962. Prehistoric Rock Art of Nevada and Eastern California. Univ. of Calif. Press, Berkeley, Los Angeles, London. 412 p. and <Bibliography>
The ancient originators of the structures and art displayed are posthumously respectfully acknowledged. For teaching purposes only; do not review, quote or abstract.