J.G. Hall 1952 Sagehen Creek, 3 mi. NW Hobart Mills, Nevada Co., Calif. July 11 aspen, ignoring large trees growing on water's edge. In other places they cut large trees at water's edge. We decided to mark trees in general zone of use. As it's very difficult to determine the exact limits to the zones of use, this is a more or less arbitrary count but at least should give some indication of % of use of various diam. classes when completed. Marked about 430 trees. Weather hazy to cloudy bright gentle July 12. breeze. Left 4:30 P.M. Lowermost colony, 3 PM. Heckman & I mapped some of the import- ant points by traversing using Brunton compass & steel tape. This goes much faster than the base-line plane table method, especially in brushy cover. Left 6:30 PM. Weather threat-ening & lightning & thunder & a July 14 short shower. Upper Pond 10 AM. Saw lots of Picket pin ground squirrels on way up on Kiln Meadow. Spent most of day completing tabulation of unused aspen and adding some used we missed before. Follow-ing table lists unused trees by diameter categories with totals.