The Historical Resource Base Series maps are a series of road and access maps created between 1982 and 1997. These printed monochrome maps are named using the National Topographic System (NTS) map sheet identifier within Alberta and contain the following features: roads and highways. railways and railway points. pipelines. trails. major transmission lines. airfields. municipalities. bodies of water. and natural resource sites. These maps are available as non-georeferenced PDF files and are available as TIFF files on request (please see the Distribution Information). Please refer to the maps for the most current dates.