ISBN 0-938216-56-2
http://www.grandcanyon.org/booksmore/epubs/pillar/pdfs/cover_and_frontmatter.pdf
George H. Billingsley
U.S. Geological Survey
2255 N. Gemnini Drive
Flagstaff, Arizona
Earl E Spamer
Academy of Natural Sciences
1900 Benjamin Franklin Parkway
Philadelphia, Pennsyvania
Dove Menkes
Fullerton, California 92833
