ARTILLERY FOR THE LAND SERVICE OF THE UNITED STATES. 12 PDR GUN NAPOLEON #20. 1849 - 1865 Port Huron, MI: Anitque Ordinance Publishers, 1984 By Port Huron, MI: Anitque Ordinance Publishers, 1984. Oblong 4to with coated card stock covers. Illustrated with facsimile diagrams throughout.