Gavin Wright and Scott Farrow would like to thank Carroll Curtis for her substantial assistance on numerous environmental tables. Her work was made possible by funding from the Office of Environmental Information, U.S. Environmental Protection Agency, and from the Council on Environmental Quality.

The preparation of data for the tables on weather was partly supported by a grant from the National Institute of Child Health and Human Development. Myron P. Gutmann, Christie S. Wilson, and Timothy G. F. Kittel are grateful to J. Andrew Royle and Nan A. Rosenbloom for the work done to prepare these data. The data described as drawn from the VEMAP2 source are from the Vegetation/Ecosystem Modeling and Analysis Project, with support from the National Aeronautics and Space Administration, the Electric Power Research Institute, and the U.S. Department of Agriculture Forest Service.