GREGORIUS, Johann Gottfried. Die Curieuse Orographia, Frankfurt & Leipzig: Ritscheln, 1715, title printed in red and black, engraved frontispiece depicting 9 mountains and volcanos, contemporary calf, spine gilt (crudely repaired) -- Joseph HAMEL. Beschreibung zweyer Reisen auf den Montblanc unternommen im August 1820, Vienna: Carl Jerold, 1821, 8°, tinted lithographed frontispiece, folding engraved map (occasional spotting), original printed wrappers (lightly soiled); and 15 others in German on Switzerland and the Alps, most 19th-century. (17)