Well, if you ever decide to sell that Jind cover, or need to prove its authenticity, a BPA Certificate is a must. It's the only genuinely authoritative certificate for the Indian States.
Here is the link for a detailed study of Alwar:
http://www.stampboards.com/viewtopic.php?t=16831If you decide you want to do the Indian States properly, you really should join the India Study Circle,
http://www.indiastudycircle.org/index.html - it has produced a number of handbooks on India and the States, including one on Alwar, which formed the basis of the link above.
For more on Poonch, you can't go past
The Stamps & Postal History of Poonch by George Harell. You'll find copies occasionally on
ebay, and I'm sure
Amazon will still have it, too.