| Commentary by Albert Van Helden, science and astronomy professor at the University of Utrecht
Supplementary essay on Latin abbreviations
Searchable, cross-linked English translation of the Latin text
Searchable live text
Collation and binding description
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Windows, Mac, and UNIX compatible
PDF file on CD-ROM
Adobe Reader 4.0 with Search software
Digital images of every page of this rare book, cover to cover, in full color, presented as uncropped spreads
Files for printing and viewing in black-and-white and color included
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