opac.lib.oita-u.ac.jp
Find digitized publications and collection items through an online library.
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library.olympics.com
Library catalogue and portal to Olympic knowledge.
onos.gov.in
Find digitized publications and collection items through an online library.
onesearch.slq.qld.gov.au
Online library catalogue for State Library of Queensland.
ester.ee
Shared catalogue of the largest libraries of Estonia.
opac.pnm.gov.my
Research index for locating articles, books, authors and citation information.
oaji.net
Database of open-access scientific journals.
openaire.eu
Network of Open Access repositories, archives and journals that support Open Access policies.
orcabook.com
Find scholarly literature and bibliographic records using structured search fields.
otzarhasefer.com
Research index for locating articles, books, authors and citation information.
parsifal.urbe.it
Collective catalogue of the libraries of the URBE network in Rome.
inist.fr
Research index for locating articles, books, authors and citation information.
philobiblon.upf.edu
Bibliographic database for vernacular works written in the Iberian Peninsual during the Middle Ages and part of the Renaissance.
sigb.net
Research index for locating articles, books, authors and citation information.
nauka-polska.pl
Online database of science in Poland.
porbase.bnportugal.gov.pt
Portuguese National Bibliographic Database.
portacultura.gr.ch
Find digitized publications and collection items through an online library.
bne.uni-osnabrueck.de
Find digitized publications and collection items through an online library.
priceonepenny.info
Bibliographic database of literature published in penny weekly numbers in London between 1837 and 1860.
catalog.princeton.edu
Catalog of Princeton University Library.
psiref.com
Online bibliographic database (2023-).
apa.org
American psychologic bibliographic database.
pub.uni-bielefeld.de
Dataset repository covering humanities and social, with searchable datasets.
sfuvet.swiss
Repository and bibliography of Swiss Federal University of Vocational Education and Training in Switzerland.