Guide for Russian saltpeter-makers from the former State Berg-Collegium, St.

Petersburg, Schnorr Press, 1811, 95 pages. Treatise by the Russian scientist Petr Ivanovich Meder (1769-1826). Engaved plate at the end of the book depicting 10 figures. 20th-century bindings: gold-stamped leather spine, coloured paper. 24.5х19.5сm., in good condition: traces of library labels. The edition is of importance to collectors.