Robertson (John): A Treatise of Such Mathematical Instruments As Are Usually Put into a Portable Case, third edition, 8vo, for J. Nourse, 1775, 11 folding engraved plates (damp-stained), contemporary sheep (spine and upper cover lacking) -- Wells (Edward): The Young Gentleman's Astronomy, Chronology, and Dialling, fourth edition, three parts in one, 8vo, for James, John, and Paul Knapton, 1736, 26 engraved plates, several double-page, contemporary calf (rebacked, inner hinges repaired); and four others. (6)