YOSEMITE Vegetational Changes in Yosemite Valley NPS Occasional Paper No. 5

Although individuals made this study possible, the financial support and the personal interest of staff at the U. S. National Park Service in Yosemite Valley and the Regional Office in San Francisco were the keys to the success of the project. Robert P. Gibbens searched the historical records; Earl Alexander and James Crawford did much of the soil survey; and Robert L. Ziegler and James Bartolome sampled the vegetation. This help is acknowledged gratefully.