Oling Manuscripts Two manuscript volumes, 1800-1801, containing works of Lucas Oling, including diagrams: (1) Aanleiding tot de hoogere meetkunde of duidelijk onderricht van de geometrie der kromme lijnen door Lucas Oling (Introduction to geometry or clear instruction on the geometry of curved lines), Leeuwarden, 1801, with a portrait [of Oling?] pasted into the front beneath a paragraph signed J H van Swinden, Amsterdam, Jun 1804 (f 1v) (2) Mathematische oeffeningen. Algebraische en geometrische oeffeningen (mathematical exercises), Leeuwarden, 1800. 1800-1801