Nathaniel Michler (September 13, 1827 - July 17, 1881) was an American military officer and mapmaker who served during the American Civil War. Born in Easton, Pennsylvania, Michler attended West Point, from which he graduated seventh in his class. Commissioned as a 2nd Lieutenant in the Topographical Engineers, Michler participated in the Mexican Boundary Survey from 1851 until 1857, when he was transferred to serve as the chief topographical engineer in surveys for a proposed canal from the Gulf of Darien to the Pacific Ocean from 1858 until 1860. He held the rank of Captain at the outbreak of the American Civil War and served with the Army of the Cumberland from 1861 - 1863, then was transferred to the Army of the Potomac and built defensive works for the Union Army at the Battles of the Wilderness, Spotsylvania, Cold Harbor, and Petersburg. He was promoted to Colonel in August 1864 and brevetted Brigadier General in April 1865. After the war, Michler served as superintendent in the District of Columbia until 1871 and from 1872 to 1875 was chief engineer with the General Commanding Division of the Pacific. He acted as military attaché for the United States Legation in Vienna, Austria from 1878 to 1880. More by this mapmaker...

John T. Bowen (b. c. 1801 - 1856) was a lithographer active in Philadelphia during the mid-19th century. Born in England, Bowen immigrated to the United States in 1834 and worked as a colorist and lithographer in New York City before moving to Philadelphia in 1838, most like with his collaborator and lithographic artist Alfred Hoffy. Once in Philadelphia, Bowen took over the business of Wild and Chevalier, located at 94 Walnut Street, and began publishing History of the Indian Tribes by McKenney and Hall. He also acquired the rights to Wild and Chevalier's series of views of Philadelphia, which he reissued at the end of 1838 and again in a hand colored edition in 1848. By the early 1840s, Bowen's work was garnering praise, and gained a reputation as one of the best lithographers in Philadelphia. He published the 'Architect's Digest' in 1839 and printed plates for Audubon's Quadrupeds (1845 - 1848) and the octavo edition of Birds of America (1839 - 1844). Despite numerous successes, Bowen field for bankruptcy in 1842, though it did not prove to be too much of a hindrance to his career, as, after 1844, he began working predominantly with Audubon and his sons on their works. Over the course of his career, Bowen became the preeminent Philadelphia lithographer and the most important mid-19th century American publisher of publication plates. By Bowen's death in 1856, he had a fairly substantial estate and a prosperous business. His wife, Lavinia, with whom he had a son, took over the business after her husband's passing and the firm Bowen and Company operated until around 1870. Learn More...