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web.unito.it
Online digital collection at the University of Turin, Italy.
openalex.org
Open Alex helps search books, ebooks, papers, library records, or reading archives.
openknowledgemaps.org
Open Knowledge Maps helps search books, ebooks, papers, library records, or reading archives.
openpaymentsdata.cms.gov
Open Payments helps search books, ebooks, papers, library records, or reading archives.
orka.bibliothek.uni-kassel.de
Digital library for searching books, documents, images and online collections.
open-slum.org
Open Slum helps search books, ebooks, papers, library records, or reading archives.
open-slum.pages.dev
Open Slum helps search books, ebooks, papers, library records, or reading archives.
explore.openaire.eu
OpenAire helps search books, ebooks, papers, library records, or reading archives.
v2.sherpa.ac.uk
OpenDOAR helps search books, ebooks, papers, library records, or reading archives.
open.bccampus.ca
OpenED helps search books, ebooks, papers, library records, or reading archives.
openedition.org
OpenEdition helps search books, ebooks, papers, library records, or reading archives.
openmaktaba.com
OpenMaktaba helps search books, ebooks, papers, library records, or reading archives.
openmd.com
OpenMD helps search books, ebooks, papers, library records, or reading archives.
openstax.org
Openstax helps search books, ebooks, papers, library records, or reading archives.
philschatz.com
OpenStax College Textbooks helps search books, ebooks, papers, library records, or reading archives.
orionsarm.com
OrionsArm helps search books, ebooks, papers, library records, or reading archives.
ownersman.com
Ownersman.com helps search books, ebooks, papers, library records, or reading archives.
global.oup.com
Series of reference materials published by Oxford University Press and digital library collection at Oxford Reference Online.
oyez.org
Oyez helps search books, ebooks, papers, library records, or reading archives.
pagebypagebooks.com
Page by Page Books helps search books, ebooks, papers, library records, or reading archives.
pagella.bm-grenoble.fr
Digital library of Grenoble's heritage.
pandora.nla.gov.au
Pandora helps search books, ebooks, papers, library records, or reading archives.
papalencyclicals.net
PapalEncyclicals helps search books, ebooks, papers, library records, or reading archives.