Abstract The Tahoe Regional Planning Agency Records date from 1963-2008. Ziegler was an environmental engineer, who from 1989-1994 was executive director of TRPA. The collection includes TRPA reports and some from the earlier Lake Tahoe Area Council organization, and the 2002 Supreme Court decision and associated documents on the Tahoe-Sierra Preservation Council (TSPC) vs. Tahoe Regional Planning Agency (TRPA) case.