Many libraries have already digitized rare books, maps, historical and current scientific journals and publication series. Here is an overview of a number of important websites.

Biodiversity Heritage Library
biodiversitylibrary.org
A consortium of natural history, botanical, research and national libraries that make their natural history literatur feely available.

HathiTrust
hathitrust.org
An association of libraries worldwide, that make digitized collections available.

Europeana
europeana.eu/en
Europeana is a virtual library that makes the scientific and cultural heritage of Europe available to the public in the form of images, text, audio and video files.

Hamburger Kulturgut Digital
digitalisate.sub.uni-hamburg.de
Digitized collection of the Staats- und Universitätsbibliothek Hamburg

Münchner DigitalisierungsZentrum
digitale-sammlungen.de/en/
digitized collections of the Bayerische Staatsbibliothek and other institutions

digitized collections of the Staatsbibliothek zu Berlin
digital.staatsbibliothek-berlin.de