.azw1 is the Topaz format. From the Wiki:
Topaz:
Quote:
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Most agree that Topaz is a collection of glyphs arranged on pages, along with an unproofed OCR text version. It is used to make older books and foreign language available quickly, since conversion is essentially automatic from scans of the pages of a book, but it reflows very well.
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Those problems are very much to be expected, and you will have to proofread the book yourself.
