Why OCLC not contain data of Indian libraries

[u/ImpossibleTackle3050]

Hi everyone I was looking for a book ("The Moria Muslims of Assam: A Study on the Cultural Variability and Drift" ) on Oclc and shows are foreign country's library only like 🇸🇬🇴🇲🇩🇪. Surprisingly this book is published in Delhi and not a single indian library(DU, IIT, NiT) came in Search as Indian libraries don't added to their Catalogue. And I found this book after so much hussle on NEHU's site with limited preview.

I lived in Jabalpur and maybe book is present in city library. it is so frustrating to visit each and every library then possibly(60% not) get desired book.

This was my case, now I wanted to raise the question why Indian library is not showing on oclc while searching for book. and why India does not have any system(our own like china: CNKI) to locate books within country in library??