royalroad.com
Royal Road helps search books, ebooks, papers, library records, or reading archives.
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rpc-wiki.net
RPC Authority helps search books, ebooks, papers, library records, or reading archives.
rpubs.com
RPubs helps search books, ebooks, papers, library records, or reading archives.
ortus.rtu.lv
Research data portal for exploring engineering records, including datasets.
rucore.libraries.rutgers.edu
Research data portal for exploring humanities and social records, including experimental data.
rvb.ru
Search an online collection of books, documents, media and archival records.
ruverses.com
RuVerses helps search books, ebooks, papers, library records, or reading archives.
sacred-texts.com
Sacred Text Archive helps search books, ebooks, papers, library records, or reading archives.
safe-manuals.com
SafeManuals helps search books, ebooks, papers, library records, or reading archives.
cprsurvey.org
Research data portal for exploring atmospheric, oceanography and climate records, including datasets.
sanockabibliotekacyfrowa.pl
Search an online collection of books, documents, media and archival records.
sadar.uni-halle.de
Research data portal for exploring basic in biology and medicine records, including genomic data.
scanlate.io
Scanlate helps search books, ebooks, papers, library records, or reading archives.
scanlibs.com
ScanLibs helps search books, ebooks, papers, library records, or reading archives.
scans.gg
Scans.gg helps search books, ebooks, papers, library records, or reading archives.
scb.se
Browse public datasets, metadata and downloadable records in an open catalog.
scholarsbank.uoregon.edu
Research data portal for exploring geosciences records, including datasets.
addons.mozilla.org
ScholarKey helps search books, ebooks, papers, library records, or reading archives.
ir.library.oregonstate.edu
Research data portal for exploring engineering records, including image.
sci-hub.red
Sci Hub helps search books, ebooks, papers, library records, or reading archives.
sci-hub.ru
Sci-Hub helps search books, ebooks, papers, library records, or reading archives.
scialert.net
SciAlert helps search books, ebooks, papers, library records, or reading archives.
sciarium.com
Sciarium helps search books, ebooks, papers, library records, or reading archives.
mol.medicalonline.jp
Bibliographic database for finding publications, citations and scholarly records.