Hi Steve! The DLR archive is great. It has tons of citation information. I've even tracked down some English translations from it, which I didn't expect at all.

Speaking of translations, does the GDC collection contain both German documents and English translations? I have some MAP-VG translations where I haven't been able to find the original document, to the point where I kinda wonder whether it even exists. The original might have just ended up in this collection, for all I know.