A set of over 6,000 historical maps of South Asia produced by the Survey of India at a scale of one inch per mile (1:63,360), or at the more modern metric scale of 1:50,000. These maps cover the territory of present day Pakistan, India, Nepal and Bangladesh, and in general were produced during the 20th century. Each map covers an area of 15 minutes of latitude by 15 minutes of longitude, and thus there are a total of 256 individual 63k maps to cover a 4 degree by 4 degree block. The file naming convention is to first give the number of the 4 degree x 4 degree block followed by the letter (A to P) of the sixteen 1 degree x 1 degree blocks in each 4 degree block eg. 38 D, and this is followed by a "]" symbol to indicate a slash and then a number from 01 to 16 to indicate the number of the map in the 1 degree block. This Number Letter Number designation is followed by the name of one of the administrative districts encompassed by the map, followed by the date of publication in parenthesis. If a map is reprinted without changes sometime after its initial publication, it is the date of initial publication that is used. Two Index Maps are provided to assist the viewer in selecting a map of interest. The first index map with the title "0 Topographical Indexes of Survey of India 253k and 126k" showing the sheet numbering system is provided as the first entry in the list of files. A second set of index maps showing greater detail, with a complete page for each 4 degree block, and the title "0 Index to Survey of India 63k and 50k maps" is also provided. The individual maps are then listed in numerical order by sheet number. More than one map will be shown for each geographic block when maps with different publication dates are available. The viewer may find it convenient to use the Search Function (Windows: Ctrl-F or Mac: Cmd-F) to quickly navigate to a particular map of interest. A click on the "Preview" button will open a preview image, but it will be located at the very top of the file list. A click on the "Download" button will download the map file to the viewer's computer. These map scans are collected from many sources, and the quality of the scans as well as the underlying paper maps is uneven. Some scans are professionally done, while others are of poor quality. On the assumption that 'some map is better than no map,' we include the poor quality scans until a better copy can be obtained.