[U.S. Environmental Protection Agency, National Eutrophication Survey] ; with the cooperation of the Pennsylvania Department of Environmental Resources and the Pennsylvania National Guard
Date
[1976]
Series
Working paper (United States. National Eutrophication Survey) ; no. 420
[U.S. Environmental Protection Agency, National Eutrophication Survey] ; with the cooperation of the Pennsylvania Department of Environmental Resources and the Pennsylvania National Guard
Date
[1975]
Series
Working paper (United States. National Eutrophication Survey) ; no. 428
[U.S. Environmental Protection Agency, National Eutrophication Survey] ; with the cooperation of the Pennsylvania Department of Environmental Resources and the Pennsylvania National Guard
Date
[1975]
Series
Working paper (United States. National Eutrophication Survey) ; no. 418
[U.S. Environmental Protection Agency, National Eutrophication Survey] ; with the cooperation of the Pennsylvania Department of Environmental Resources and the Pennsylvania National Guard
Date
[1975]
Series
Working paper (United States. National Eutrophication Survey) ; no. 422