HEISIG, Paul M., U. S. Geological Survey, New York Water Science Center, 425 Jordan Road, Troy, NY 12180, WILLIAMS, John H., U. S. Geological Survey, 425 Jordan Road, Troy, NY 12180 and RANDALL, Allan D., U.S. Geological Survey, Emeritus, New York Water Science Center, 425 Jordan Rd., Troy, NY 12180
WILLIAMS, John H., U. S. Geological Survey, 425 Jordan Road, Troy, NY 12180 and HEISIG, Paul M., U.S. Geological Survey, 425 Jordan Road, Troy, NY 12180