Roy (William) An Account of the Trigonometrical Operation, Whereby the Distance Between the Meridians of the Observatories of Greenwich and Paris has Been Determined ... from the Philosophical Transactions, first separate edition, [1790].

Roy (William) An Account of the Trigonometrical Operation, Whereby the Distance Between the Meridians of the Observatories of Greenwich and Paris has Been Determined ... from the Philosophical Transactions, first separate edition, 11 engraved folding plates, 4 folding tables, some minor spotting, bookplate, original wrappers, contemporary ink inscription 'Lord Heathfield' to upper cover, spine chipped, some loss to lower cover, 4to, [1790].