If you are just interested in the South Asia history and culture, or you are a scholar researching on the geo-politico-social aspect of South Asia, here is a very useful link for you. The Digital South Asia Library has a collection of rare resources difficult to find elsewhere in digital format. There are collections on documents concerning India and South Asia region as well as old maps of the region.
If you want to see maps of India region, its states and major cities during the British colonial period, here are a few links.
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