Guide to Rock Art of the Utah Region: Sites With Public Access
Dennis Slifer is a geologist with the New Mexico Environment Department in Santa Fe, New Mexico. He has logged thousands of miles in the Southwest studying rock and giving lectures to professional and community groups. He is the author of Caves of Maryland, Signs of Life: Rock Art of the Upper Rio Grande, and co-author of Kokopelli: Fluteplayer Images in Rock Art (both also published by Ancient City Press).