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1975
Williamson, Kenneth, and David A. Bella. Monitoring methods for estuarine benthic systems In Bulletin - Engineering Experiment Station, Oregon State University, Corvallis. Vol. no.52. Corvallis, OR: Oregon State University Engineering Experiment Station, 1975.
Bella, David A.. Tidal Flats in Estuarine Water Quality Analysis. Corvallis, Or.: Department of Civial Engineering, Oregon State University, 1975.
1968
Bella, David A., and W. E. Dobbins. "Difference modeling of stream pollution." In Journal of the Santiary Engineering Division. Proceedings of the American Society of Civil Engineers, p 995-1016. Vol. SA5, 94., 1968.