Galileo's personal copy, in which he noted in the margins the plagiarised sections and errors that revealed Capra's lack of understanding of the instrument, is in the Biblioteca Nazionale Centrale di Firenze (Bibl. Palatina, Ms Gal. 40/Tomo 11).
Institutional copies are held at Milan, Biblioteca Nazionale Braidense; Pisa, Biblioteca universitaria; Turin, Biblioteca nazionale universitaria; Rome, Museo Astronomico e Copernicano; Florence, BNCF (2 copies, including Galileo's own); Munich, Bavarian State Library; Leipzig, Biblioteca Albertina; Ljubljana, National and University Library. Of the five copies ICCU lists in Italian libraries, just one is a variant without the engraving on the title-page.
Sotheby's is grateful to Prof. Nick Wilding for the census of copies.
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