ISFDB-Supported Secondary Verification Sources

#	Label	Name	URL
1	Bleiler Early Years	Science-Fiction: The Early Years	http://www.isfdb.org/wiki/index.php/Reference:BleilerEarlyYears
2	Bleiler Supernatural	The Guide to Supernatural Fiction	http://www.isfdb.org/wiki/index.php/Reference:BleilerSupernatural
3	Bleiler1 (Gernsback)	Science-Fiction: The Gernsback Years	http://www.isfdb.org/wiki/index.php/Reference:Bleiler1
4	Bleiler78	The Checklist of Science-Fiction and Supernatural Fiction (1978)	http://www.isfdb.org/wiki/index.php/Reference:Bleiler78
5	Clute/Grant	The Encyclopedia of Fantasy	http://www.isfdb.org/wiki/index.php/Reference:Clute/Grant
6	Clute/Nicholls	The Encyclopedia of Science Fiction, 2nd edition	http://www.isfdb.org/wiki/index.php/Reference:Clute/Nicholls
7	Contento1 (anth/coll)	Index to Science Fiction Anthologies and Collections	http://www.isfdb.org/wiki/index.php/Reference:Contento1
8	Currey	Science Fiction and Fantasy Authors: A Bibliography of First Printings of Their Fiction and Selected Non-Fiction	http://www.isfdb.org/wiki/index.php/Reference:Currey
9	FMI	The FictionMags Index	https://isfdb.org/wiki/index.php/Reference:FMI
10	Locus1	The Locus Index to Science Fiction: 1984-2005	http://www.isfdb.org/wiki/index.php/Reference:Locus1
11	Miller/Contento	Science Fiction, Fantasy, & Weird Fiction Magazine Index (1890-2007)	http://www.isfdb.org/wiki/index.php/Reference:Miller/Contento
12	OCLC/Worldcat	OCLC/Worldcat	http://www.isfdb.org/wiki/index.php/Help:Using_Worldcat_data
13	Reginald1	Science Fiction and Fantasy Literature, a Checklist, 1700-1974	http://www.isfdb.org/wiki/index.php/Reference:Reginald1
14	Reginald3	Science Fiction and Fantasy Literature, 1975-1991	http://www.isfdb.org/wiki/index.php/Reference:Reginald3
15	Tuck	The Encyclopedia of Science Fiction and Fantasy through 1968	http://www.isfdb.org/wiki/index.php/Reference:Tuck

ISFDB-Supported Secondary Verification Sources

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