Sure thing Charcloth, I agree. For US, a good starting point is:

Joseph M Judge
1 Waterside Drive, Suite 248
Norfolk VA 235-1607
Tel/fax: 757-322-2987 / 757-445-1867
or maybe the website is working?

They have mostly archived information, allowing check-outs and copies made, etc..But they might have more information about a collection that would be suitable for your uncle's treasures. Best of luck,
~Jen