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When citing documents from the Legacy Tobacco Documents Database, please use the "Bookmark as" TID, e.g., http://legacy.library.ucsf.edu/tid/jmc24e00, instead of the URL of the PDF image. LTDL says the "Bookmark as" URL will never change, but someday PDF images may no longer exist. The "Bookmark as" URL also contains all the reference info on the document, making it more useful.