EULER, Leonhard. Opuscula varii argumenti, Berlin: sumtibus A. Haude & Jo. Carol. Speneri, 1746-51, 4°, 3 volumes in one, 12 folding engraved plates (library markings, including perforation on first title, title to vol. III thumb-soiled, some browning), library buckram. [Brunet II, 1092; Honeyman 1064; Houzeau & Lancaster 3482] Provenance: Berlin Collection