Does any one have a list of good reference sites?

I am currently looking for information on the
Dutch 7.9X57R machine gun round AKA Schwarzlose.

Its not a list but I find this site to have some good info. Its in Spanish but that is easy fixed with a web translator. I use the one on my Google toolbar. Your cartridge is there, click on Fuego Centrale (centre fire) in the left menu & find it from there.
Steve

Thanks Steve