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Not really sure how to do this, as am not expert on PDFs. Am assuming that text portions of scanned page would have been converted to text elements with characters etc., and that remaining portions of scanned page would have been stored as some sort of directly embedded raster images (inline images). Am further assuming that anyone with Adobe Acrobat or similar would be able to extract such raster images and display in a program which shows pixel dimensions. Lots of assumptions there (...). OTOH, the boiler image you show above seems reasonably detailed. MH
Hmmm... could a RMC collection be far behind?