http://biblioteca.ubl.ac.cr/cgi-bin/koha/opac-search.pl?q=ccl=Provider%3ASunday%20School%20Union%2C&format=rss2 4 0 50 ISBN http://biblioteca.ubl.ac.cr/cgi-bin/koha/opac-detail.pl?biblionumber=1627 By Kennedy, John. London : Sunday School Union, 1880 . xii, 404 p. ; 19 cm.

]]> http://biblioteca.ubl.ac.cr/cgi-bin/koha/opac-detail.pl?biblionumber=1627 ISBN http://biblioteca.ubl.ac.cr/cgi-bin/koha/opac-detail.pl?biblionumber=1491 By Annett, Edward A. (Edward Aldridge). London : National Sunday School Union, . 116 p. ; 19 cm..

]]> http://biblioteca.ubl.ac.cr/cgi-bin/koha/opac-detail.pl?biblionumber=1491 ISBN http://biblioteca.ubl.ac.cr/cgi-bin/koha/opac-detail.pl?biblionumber=2732 By Barton, George Aaron, 1859-1942.. Philadelphia, Pa. : American Sunday-school Union, 1937 . xxxvi, 607 p. ; 22 cm..

]]> http://biblioteca.ubl.ac.cr/cgi-bin/koha/opac-detail.pl?biblionumber=2732 ISBN http://biblioteca.ubl.ac.cr/cgi-bin/koha/opac-detail.pl?biblionumber=4364 By Bryson of Tientsin, Mrs.. London : The Sunday School Union, 1894 . 144 p. ; 18 cm..

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