redditreads.com
Reddit link helps search books, ebooks, papers, library records, or reading archives.
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mendeley.com
Reference Manager helps search books, ebooks, papers, library records, or reading archives.
rehold.com
Property record search site for finding addresses, home history, residents, and real estate data.
repair.wiki
RepairWiki helps search books, ebooks, papers, library records, or reading archives.
repec.org
RePEc helps search books, ebooks, papers, library records, or reading archives.
Index providing access to music periodical literature published between 1750 and 1966.
Nonprofit organization offering digital collections and tools for locating research on musical topics.
Bibliographic database for finding publications, citations and scholarly records.
repbib.uni-trier.de
Repertory of medieval literature commenting on the Bible.
phrepo.phbern.ch
Search an online collection of books, documents, media and archival records.
myanonamouse.net
Requires Invite helps search books, ebooks, papers, library records, or reading archives.
researchgate.net
ResearchGate helps search books, ebooks, papers, library records, or reading archives.
wiki.restarters.net
Restarters helps search books, ebooks, papers, library records, or reading archives.
retractionwatch.com
Retraction Watch helps search books, ebooks, papers, library records, or reading archives.
retrosix.wiki
RetroSix helps search books, ebooks, papers, library records, or reading archives.
rr.reuser.biz
Reuser is an OSINT resource for online investigations, research links, search methods, and public data tools.
rentry.co
Rivestream helps search books, ebooks, papers, library records, or reading archives.
research.rkd.nl
Digitized card catalog database in the Netherlands RKD (called Hofstede de Grootfiches).
romance.io
Romance.io helps search books, ebooks, papers, library records, or reading archives.
rsarchive.org
Rosicrucian Esotericism Lecture helps search books, ebooks, papers, library records, or reading archives.
bn-r.fr
Search an online collection of books, documents, media and archival records.
archives.vwml.org
Online folk song and broadside indexes and bibliography/discography from the Vaughan Williams Memorial Library.
royalroad.com
Royal Road helps search books, ebooks, papers, library records, or reading archives.
rpc-wiki.net
RPC Authority helps search books, ebooks, papers, library records, or reading archives.