1848 Joshua W. Ash Map of Delaware County, Pennsylvania

Joshua W. Ash (July 3, 1802 - February 26, 1879) was an American physician, railroad tycoon, and mapmaker active in Delaware County, Pennsylvania, in the middle part of the 19th century. Ash was the director of the mine Hill Railroad and Allegheny Railroad. He was also involved with the Apprentices' Library of Philadelphia and the Pennsylvania Training School for Feeble-Minded Children at Elwyn (Elwyn Institute), Delaware County, PA.

Robert Pearsall Smith (February 1, 1827 - April 17, 1898) was an American map maker active in Philadelphia from the middle to late 19th century. Smith was born to a Quaker family in Philadelphia, all librarians and publishers. Robert Pearsall originally ran a law bookstore at 19 James Street, Philadelphia. It was not until 1846 that Smith began producing maps in collaboration with this father, John Jay Smith, and brother, Lloyd P. Smith. One year earlier, in 1845, John Jay, then librarian at the Library Company of Philadelphia and Loganian Library, acquired the American rights to the anastatic process of transfer lithography. In February of 1846 he and his two sons founded the Anastatic Office, a printing concern based on the anastatic process located at 317 Market Street, Philadelphia. The Anastatic Office produced numerous copies and reissues of historic documents and maps from the Library Company's collection before being dissolved in 1847. In the same year Robert Pearsall opened a printing establishment under his own name at 144 Chestnut Street. Smith was also deeply religious, a lay leader in the Holiness Movement in the United States and the Higher Life Movement in Great Britain. Smith and his wife, Hannah Tatum Whitall, first crossed the Atlantic to preach in England, Germany and Switzerland in 1873. They returned in 1875, preaching in Brighton, where Smith supposedly had an affair with an American writer. In, 1888, his entire family moved to England.

Gustavus Kramm (September 1, 1808 - August 15, 1864) was a German born line engraver and lithographer based in Philadelphia in the middle part of the 19th century. Kramm was born in Frankfurt-au-Main. He immigrated to the United States sometime in the 1830s, where he completed contract engraving in both New York and Philadelphia. His is known to have worked for Lehman and Duval, the Library Company of Philadelphia, Robert Pearsall Smith, George Worley, and others. He seems to have been active in Philadelphia exclusively between 1844 and 1854, when he completed his most significant cartographic engraving work from offices he shared with L. N. Rosenthal at the southeast corner of Third and Dock. He lived at 1 Emslie Alley and later at 27 Wharton street. In 1854, he relocated to Cincinnati and later St. Louis. In 1863, during the American Civil War, he enlisted in the 37th Iowa Volunteer Infantry Regiment, known commonly as the 'Greybeard Regiment' for its requirement that all members be over 45 years of age. Due to the advanced age of its constituency, the 37th Iowa saw little action, serving primary in a support capacity. Nonetheless, Kramm is reported to have died of an 'accident' with serving in Memphis, Tennessee.