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The PG books that are under copyright all have a C after the PG number (xxxxxC). There aren't a lot of them.
More and more of the older books are being corrected, having a more recent and more compact header/footer added, and having an html version made. In general, however, given a choice of several versions of the same title, choose the one with the higher number. The numbers are assigned sequentially so the higher number books have been produced more recently than the lower number ones. They are more likely to have an html version and are more likely to be illustrated.
JulietS
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