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Hi. I think every paperweight reference source (book, website, museum etc) is likely to contain a number of 'errors', because although authors / curators usually do their best at the time, new information comes to light later. I say 'usually' because a few authors just repeat what others before them have said - sometimes 50 years or more ago - without considering whether it still makes sense (the online 'Hobbizine' articles on paperweights being prime examples).
Generally, the older the book, the more incorrect or outdated information it will contain.
Alan