Biblioteca Nacional Digital Brasil http://bndigital.bn.br/
Biodiversity Heritage Library http://www.biodiversitylibrary.org/
Books (Open Librarry) http://openlibrary.org/books
Decapoda AtolSearch References http://decapoda.nhm.org/references/search.html
Biologia Centrali Americana (Electronic) http://www.sil.si.edu/DigitalCollections/bca/
Göttinger Digitalisierungszentrum Browsen http://gdz.sub.uni-goettingen.de/gdz/
Index Animalium http://www.sil.si.edu/digitalcollections/indexanimalium/
Internet Archive http://archive.org/index.php
Biblioteca Digital Mundial http://www.wdl.org/pt/
Searcheable Ornithological Research Archive http://sora.unm.edu/
Sistema Naturae (1758) http://commons.wikimedia.org/wiki/File:Sistema_Naturae_(1758).pdf
