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Some of mine have ISBNs and so don't. Sometimes finding an author is tricky, so I'll use the publisher if necessary.
Another document I chose not to enter was a description of tours available of Hong Kong. I went on one of the tours and kept the brochure. I guess it was more commercial than I thought ought to go into LibraryThing.
I have several small pamphlets that you get when going to museums. Some of them describe the current exhibits, while others just summarize what is in the museum, something about the founder - this often for very small museums.