United States. Soil Conservation Service, Washington (State). Department of Natural Resources, & Washington State University. Agricultural Research Center. (1989). Soil survey of Skagit County Area, Washington. The Service.
Chicago Style (17th ed.) CitationUnited States. Soil Conservation Service, Washington (State). Department of Natural Resources, and Washington State University. Agricultural Research Center. Soil Survey of Skagit County Area, Washington. [Washington, D.C.?]: The Service, 1989.
MLA (9th ed.) CitationUnited States. Soil Conservation Service, et al. Soil Survey of Skagit County Area, Washington. The Service, 1989.
Warning: These citations may not always be 100% accurate.