Walter Irving Hatch and Charles T. Krebs, "Hydrocarbon levels in the Potomac River Estuary as determined through analysis of the American Oyster (Crassostrea virginicia) and the brackish water clam (Rangia cuneata) : final report" (Annapolis, Md.: Maryland Dept. of Natural Resources, Coastal Resources Division), 1982 December, Box: 16, Folder: 3. Collection on St. Mary's County and Maryland, MSS-014. St. Mary's College of Maryland Archives.

Walter Irving Hatch and Charles T. Krebs, "Hydrocarbon levels in the Potomac River Estuary as determined through analysis of the American Oyster (Crassostrea virginicia) and the brackish water clam (Rangia cuneata) : final report" (Annapolis, Md.: Maryland Dept. of Natural Resources, Coastal Resources Division), 1982 December, Box: 16, Folder: 3. Collection on St. Mary's County and Maryland, MSS-014. St. Mary's College of Maryland Archives. https://smcm.as.atlas-sys.com/repositories/2/archival_objects/14604 Accessed May 05, 2024.