A comprehensive guide to books published before 1500:

http://15booktrade.ox.ac.uk/ .

An international project dedicated to the study of Arabic and Latin versions of Ptolemy’s astronomical and astrological texts:

http://ptolemaeus.badw.de/ .

A geospatial network model of the Roman word:

http://orbis.standford.edu/ .

The Bodleian Library’s database of manuscripts and images:

https://digital.bodleian.ox.ac.uk/ .

Digitized image bank of the Wellcome Collection:

https://wellcomecollection.org/works .

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