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[Greek and Latin text] Second edition, first bilingual edition, folio, (33.5 x 21.6 cm); title page in red and black with printer's device, numerous woodcut mathematical diagrams in text, ornamental head- and tailpieces and initials, pages browned, evidence of wormholes at the top centre of R, S, T very close to the seam and Kk - Mm along the seam but not interfering with the text; 18th-century full vellum with gilt lettering to spine, edges in blue, mild wormholes on upper board and spine, some soiling to boards, corners slightly rubbed; [44] 549 pp. (i.e. 551 with frequent misnumberings).

Second edition, 5 vols, 8vo (16.5 x 10 cm), pp. 349, 368, 375, 354, 375; contemporary calf, flat spines in six compartments, red morocco lettering piece to second, black morocco numbering roundel to fourth, gilt ruled, citron edges; slightly scuffed; overall a very good set.

Second edition, revised [vol I, vol II ýfirst]; 2 vols, 8vo, (22.5 x 15 cm); each vol with integral pouch to rear board containing folding diagrams, 20 and 29 respectively, numerous further diagrams and illustrations throughout both vols; publisher's brown cloth, rubbed and worn on extremities, a few marks but robust and internally, including folding maps, fine.

4to; 16 card pages, 8 colour pop-up illustrations with elaborate overlays of various steam and diesel motors seen in, amongst others, a steam train, the Wright Brothers' aeroplane, a locomotive train, etc, one of which folds out, toned, foxing and occasional soiling; publisher's green cloth boards, lacking spine, boards worn and scuffed.

Landscape folio, (40.5 x 27 cm); frontispiece, title with list of plates on verso, colour plate with text on verso, 12 pop-up colour plates with various overlay, the text block (originally issued separately with wrappers) has been tabbed into the front without the wrapper, occasional spotting; publisher's cloth-backed, embossed paper-covered boards, light rubbing and a few minor chips to boards, otherwise very good.