Ask a librarian, and then listen
Nice! ...in archives around the world lie vast repositories of information printed in ink on rustling onionskin, and images recorded on wrinkled photographic paper. As they say in the south, you can't get there from here—you have to find a car, drive out to the research facility, pull on some white cotton gloves, and page through the stuff yourself. No matter how detailed the library's finding aid (a document that lists everything in a particular collection), you may need to leaf through page after page to find whatever you're after. But make sure you're sitting down, because when you find it, the rush can take your head off.