Its a great resource and has some fascinating information in it. You may find that some books written before resources like this became available online, are incorrect because their authors could not access the original hard copy nor search through it. I'm working on some historical aspects of photographic lenses at the moment and so of the history of lens development which is often quoted does not accord with the contemporary information in the Journal. A great resorce and pages can be saved by printing to pdf.
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