With the comprehensive New Schubert Edition, which has been compiled since 1965, and the extensive research carried out by Otto Erich Deutsch with his thematic catalog, the so-called Deutsch-Verzeichnis (DV), which was published for the first time in 1951, the first systematic complete edition of Schubert's songs, which was edited by Eusebius Mandyczewski and published by Breitkopf & Härtel between 1894 and 1897, became the OLD complete edition (AGA). Nonetheless, it contains an immeasurable treasure, and its significance should not be underestimated, because some of the songs that were first published there have sources that are no longer available or cannot be found.
Since every edition of Schubert's songs also brought with it other readings, errors in the abundance of available sources, sometimes in the texts, sometimes in the music, cannot be ruled out. Therefore, it is essential to compare all available editions.
The Munich Digitization Center has digitized the complete Old Complete Edition and published it under the license Creative Commons 4.0 (CC BY-NC-SA 4.0).
The songs are located in Series XX, Volumes 1-10, plus a revision report.
It is also largely available on imslp.org.
Series XX Songs and Arias, First Volume. 1811 - 1814. No. 1-38, Bayerische Staatsbibliothek Munich, 2 Mus.pr. 3562-20,1, urn:nbn:de:bvb:12-bsb00044995-7
Series XX Songs and Arias, Second Volume. January to July 1815. No. 39-104, Bayerische Staatsbibliothek Munich, 2 Mus.pr. 3562-20,2, urn:nbn:de:bvb:12-bsb00044996-3
Series XX Songs and Melodies, Volume Three. August to the end of 1815. Nos. 105-182, Bavarian State Library Munich, 2 Mus.pr. 3562-20,3, urn:nbn:de:bvb:12-bsb00044997-8
Series XX Songs and Melodies, Volume Four. 1816. Nos. 183-288, Bavarian State Library Munich, 2 Mus.pr. 3562-20,4, urn:nbn:de:bvb:12-bsb00044998-4
Series XX Songs and Melodies, Volume Five. 1817 and 1818. Nos. 289-349, Bavarian State Library Munich, 2 Mus.pr. 3562-20,5, urn:nbn:de:bvb:12-bsb00044999-3
Series XX Songs and Melodies, Volume Six. 1819-1821 Nos. 350-400, Bavarian State Library Munich, 2 Mus.pr. 3562-20,6, urn:nbn:de:bvb:12-bsb00045000-9
Series XX Songs and Chants, Seventh Volume. From 1822 to the 'Beautiful Miller's Daughter' 1823 No. 401-452, Bavarian State Library Munich, 2 Mus.pr. 3562-20,7, urn:nbn:de:bvb:12-bsb00045002-0
Series XX Songs and Chants, Eighth Volume. Between the 'Schöne Müllerin' and the 'Winterreise' 1823-1827 No. 453-516, Bavarian State Library Munich, 2 Mus.pr. 3562-20,8, urn:nbn:de:bvb:12-bsb00045003-5
Series XX Songs and Chants, Ninth Volume. From the 'Winter Journey' to the 'Swan Song' 1827 and 1828 No. 517-567, Bavarian State Library Munich, 2 Mus.pr. 3562-20,9, urn:nbn:de:bvb:12-bsb00045004-1
Series XX Songs and Chants, Tenth Volume. Appendix. No. 568-603, Bavarian State Library Munich, 2 Mus.pr. 3562-20,10, urn:nbn:de:bvb:12-bsb00045005-6
Revision report. Series XX. Songs and Chants, Bavarian State Library Munich, 2 Mus.pr. 3562-22,1/12#11, urn:nbn:de:bvb:12-bsb00045021-5