I have just finished updating the subject database with 7,129 additional references from 52 new books and periodicals.
This brings the total number of references to 138,400 from 1,541 books, catalogues, periodicals and other miscellaneous publications.
The database is at
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The list of publications that the new references came from is at
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The complete list of 1,541 documents that are in the index is at
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Hope you all find it useful.