Before businesses could engage printers and engravers to design and manufacturer their stationery, the paper stock had to be chosen. Just as some job printers specialized in the type of ephemera they created, some paper suppliers specialized in certain forms of stationery. The Knickerbocker Card Manufactory was one such specialized supplier, as was William P. Lyon. Though Lyon did produce other forms of stationery, envelopes were his specialty. This advertisement depicts nearly forty envelope shapes and lists nearly fifty styles, varying by quality, paper color, and intended use.