sample image		filename: v4_dcw_river_lin formats: Shapefile (ascii) GIS data type: lines number of records: 213880 version note: New Projection V4, please use v4_dcw_river_lin Derived from Digital Chart of the World (DCW) dataset. Includes elevation values (1000 foot increments). For general reference purposes only. This dataset is a reprojection of the Penn State DCW files which have been available for public download since 1997. [DCW Rivers image shows 1990 Provinces as foreground]
production notes - data sources