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I am already using this to extract all items cited in a book: Creating .bib file containing only the cited references of a bigger .bib file But now I want to extract all cited items from two books.

So up to now I used:

 biber --output_format=bibtex --output-legacy-date handbook.bcf -O hpsg-handbook-bibliography.bib

Now I would like something like:

biber --output_format=bibtex --output-legacy-date handbook.bcf gt.bcf -O new-bibliography.bib

So the idea is to pass two .bcf files. Is there a trick to make this work? Alternatively the only way to get the items is to create a document including all the tex stuff from both projects. But this would be 2500 pages and probably a code nightmare.

Stefan Müller
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    create two bib-file with the entries from each book. Copy them all in one large bib-file, and then run biber --tool large.bib, biber will then create a large_bibertool.bib and remove all duplicates in the process. – Ulrike Fischer Nov 11 '21 at 16:45
  • Thanks! This worked. Very simple! Sorry for asking. – Stefan Müller Nov 11 '21 at 20:18

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