THE MICROCLIMATE IN CARLSBAD CAVERNS
by J. S. McLean

Prepared by the U.S. Geological Survey for 
the National Park Service under 
NPS Research Project. Open file report, May 1971.
Albuquerque, New Mexico.
67 pages.
Filled with geological data from the cave system, 
maps, and charts. Some wear around edges (see pictures).
Photos are of actual item being sold. If you have any questions, please ask.
Will ship USPS.