I'm trying to create a couple of simple maps for a faculty member.  She is doing research in 1920s and 30s British India and would like me to create some maps of her data from that era. 

I found modern Indian administrative boundaries pretty quickly at http://www.gadm.org/ but have been unable to find any source that has a shapefile or geodatabase (suitable for import into ArcGIS) of Indian states from the British Imperial period. 

Would appreciate any leads you might have,

Thanks,

Deborah Reichler

Hamilton College