[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. 423
[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. 421
[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. 424
[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. 417
[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. 414
[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. 419
[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. 427
[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. 413
[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. 415