General Repertory of Mineralogical, Mining, and Salt Works Literature

22. Joan. Ern. Hebenstreit’s Program on the orders of gems, with the words of C. Pliny from his Natural History, Book XXXVII, which is entirely about gems. Leipzig, 1747. 4to. 2 sheets.

23. Urban Friederich Benedict Brückmann’s Treatise on precious stones, along with a description of the so-called Salzthal stone. Braunschweig, 1757. large 8vo. 143 pages and index. (C. 825.)
Göttingen Learned Notices 1758, p. 739: a thorough and useful little work.
—— Second improved and expanded edition. Braunschweig, 1773. large 8vo. 1 alphabet and 2 sheets. (C. 273.)
General German Library, Appendix to Vol. XIII-XXIV, 1, p. 584.

b.) Urban Friederich Benedict Brückmann’s collected and own contributions to his treatise on precious stones. Braunschweig, 1778. large 8vo. 252 pages and index.
General German Library LXXII, 1, p. 132. — Appendix to Vol. XXV-XXXVI, 5, p. 3109: likewise good and instructive.

c.) Urban Friederich Benedict Brückmann’s collected and own contributions to his treatise on precious stones. Second continuation. Braunschweig, 1783. large 8vo. 250 pages.
General German Library LXII, 1, p. 132: likewise quite useful.

24. Lebret’s Oration on the specific solidity of gems examined by a burning mirror. Stuttgart. 1763. 4to. 3 sheets.
Erlangen Learned Remarks 1764, p. 132.

25. Catalog of the Kaltschmidt collection of precious and semi-precious stones. Jena, 1771. 8vo.