With nearly 32,000 members in more than 110 countries, the APS is the largest, non-profit organization for stamp collectors in the world. Founded in 1886, the APS serves collectors, educators, postal historians, and the general public by providing a wide variety of programs and services.
Annual Exhibit of the North New Jersey Federated Stamp Clubs, Inc. APS Chapter 508
"This glossary defines nearly 300 terms frequently encountered by stamp collectors and cover collectors. Precise definitions for many philatelic terms do not exist."
"The New Jersey Postal History Society was founded in 1972, to study and enjoy the many aspects of New Jersey postal history, and to share it with others students of this area of philately. Much of this information touches not only on other fields of philately, but also on many aspects of history as well."
"The American Revenue Association (ARA) is a non-profit corporation serving the needs and interests of all collectors of revenues, tax stamps, stamped paper, telegraph and railroad stamps, and general non-postal Back-of-the-Book material — U. S. and foreign, federal, state, provincial, local, municipal and private."