The latest Indian cookbook I bought was this one: 660 Indian curries
It's a huge book but covers absolutely everything. The author came to the USA from India, worked in restaurants for years, and then wrote this book. I've probably made a couple of dozen of these recipes so far and they've all turned out really, really well.
Been looking at getting that one.
Maybe one day...
Other rec for Indian food & curry book are any of the Madhur Jafray books
660 curries has only imperial measurements
Madhur is normally metric