M-block staging entry validated for model fit. Imported from staging batch duell-thimm-m, source entry 1473.
Gelli preserves at least three Montag witnesses in this title family: an undated Leipzig issue circa 1840, an Erfurt issue cited as 1863, and a second enlarged Leipzig edition of 1882. Internal Duell staging also points to an 1868 Erfurt witness, so this family remains edition-rich and should stay under one work record.
Vigeant 1882 records the Montag treatise as printed about 1840 at Wriezen an der Oder by F. Riemschneider, with fifteen lithographed plates outside the text. Continuation and later edition consolidated in phase 82.