U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Environmental Research Information[1997]<EG285-A316>
U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Environmental Research Information[1997]<EG285-A314>
U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory, Center for Environmental Research Information[1996]<NA221-A241>
prepared by Eastern Research Group, Inc. ; prepared for Center for Environmental Research Information, U.S. Environmental Protection Agency, Environmental Monitoring Systems LaboratoryU.S. Environmental Protection Agency, Office of Research and Development[1993]