This collection comprises part of the huge library formed by Georg Septimus Dieterichs (1721-1805), Count Palatine and Senator of Regensburg in the second half of the 18th century. After his death, the library was auctioned over several years in Regensburg; however, the depressed state of the European economy after the Napeolonic Wars ensured that the collection was sold slowly and comparatively cheaply. Foreign buyers were able to purchase items through the agents Gleditsch of Leipzig, and, what appears to have been the majority of the collection was purchased by the Advocates' Library in 1820, for only ý86. The collection consists of c. 52,000 items, of which c. 33,000 are academic theses of the 17th and the 18th centuries, mostly German, but with a number of Dutch dissertations. There are also a large number of German 16th-century polemical tracts written by Luther, Melanchthon and other leaders of the German Reformation and their opponents, and a considerable amount of miscellaneous material, including works by German Baroque writers, printed speeches and announcements, many of a local nature. There are also c. 250 volumes, containing 1666 items, most of which are legal theses of the 17th and the 18th century, held in the Advocates Library.
The University theses (shelf-mark Th.) are not catalogued, but there is a sheaf catalogue of them, arranged by century, available for consultation. Bibliotheca sive Catalogus Librorum quibus utitur Georgius Septimus Dieterichs, 7 pts, Regensburg, 1760-63 ([printed catalogue of the collection] NLS shelf mark AB.3.85.23). F.K.G. Hirsching, Versuch einer Beschreibung sehenswuerdiger Bibliotheken Teutschlands, Band III/2, Erlangen, 1790 (reprinted Hildesheim, 1971), 721-724. M.A. Pegg, 'A Catalogue of German Reformation Pamphlets (1516-1546) in Libraries of Great Britain and Ireland', Bibliotheca Aureliana XLV, Baden-Baden, 1973. M. Nix, 'An uncommonly heavy collection. Tons of Tomes,' in: Folio (Collections, research, events at the National Library of Scotland) 5 (Autumn 2002), pp. 2-5.
Shelfmark: DC. & Th.