미국
Cottonwood Lake Study Area-Wetland Vegetation Zones-1976
Spatial polygons of vegetation zones in 1976 for wetlands; P2, P4, T3, T4, T5, T6, T8, and T9 within the Cottonwood Lake Study Area, Stutsman County, North Dakota. Created from a collection of digital orthorectified images from aerial photographs of the study area acquired during 1976 using Stewart and Kantrud classification system.