Author David H. Johnson spent twenty years researching pioneer crossings of rugged Sonora Pass and exploring the terrain on foot. His detailed maps and color photographs graphically illustrate the obstacles that wagon trains and explorers encountered along the Walker River Trail. Biographies of over 300 Sonora Pass pioneers acquaint the reader with these brave souls. Illustrated. Appendix – Sketch of Pioneers. Appendix – Clark Skidmore Party. Indexed. Hardbound with dust jacket. Tuolumne County Historical Society. Sonora, California. 2006. 197 pages. ISBN 0965260879.