Thanks all for the replies! One advantage of the book I'm interested in is that there are available a facsimile copy and a modern equivalent copy of the book, so that detailed comparisons between the two can be made. Both must be based on a book published immediately after the author's death because there are no other very early publications as far as I know. Google Books would be ideal for the original but GB does not make it available, probably because of the availability of the 1970's facsimile book.
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