1. U.S. Forest Service; North Research Stn., Baltimore Ecosystem Study; 5200 Westland Blvd Baltimore MD 21227
2. Dep. of Earth and Planetary Sciences; The Johns Hopkins Univ; 3400 N. Charles Street Baltimore MD 21218
3. Cary Inst. of Ecosystem Studies; Millbrook MD 12545
4. Dep. of Ecology, Evolution and Natural Resources; Rutgers Univ; New Brunswick, NJ 08901, currently Cary Inst. of Ecosystem Studies, Box AB Millbrook 12545-0129