This layer is a georeferenced raster image of a portion of a scanned nautical chart titled "Bay of Biscay, Spain--north coast, Puerto de Bilbao and approaches" originally published by the National Mapping and Agency in 2000. This layer is 1 of 3 parts representing the original source sheet map. Map no. 37461 Historic paper maps can provide an excellent view of the changes that have occurred in the cultural and physical landscape. The wide range of information provided on these maps make them useful in the study of historic geography, and urban and rural land use change. As this map has been georeferenced, it can be used in a GIS as a source or background layer in conjunction with other GIS data. United States. National Imagery and Mapping Agency. (2000). Bay of Biscay, Spain--north coast, Puerto de Bilbao and approaches (Image 1 of 3) (Raster Image). LandInfo. Available at: https://purl.stanford.edu/dv504ch3806 This layer is presented in the WGS84 coordinate system for web display purposes. Downloadable data are provided in native coordinate system or projection.