Source--"Philadelphia and its manufactures : a handbook exhibiting the development, variety and statistics of the
manufacturing industry of Philadelphia in 1857 : together with sketches of remarkable manufacturies, and
a list of articles now made in Philadelphia." Philadelphia: Edward Young, 1859, 516 pgs
Along with Samuel Wagner, S. B. Parsons, and L. L. Langstroth, Mahan was one of the first importers of Italian honey bees.

