2004 Krause-Minkus Standard Catalog of U.S. Stamps: 2004 edition-Listings 1845-Date (KRAUSE MINKUS STANDARD CATALOG OF US STAMPS)
Unkrich, Steven R.／Axelrod, Herman／Bush, Mike／Clark, David A.／Collins, Leroy P., III／Crown, Francis J., Jr.／Crumbley, Tony L.／DuBois, John L.／Crumpacker, James W.／Eeles, David／Hawkins, Joel／Hoffman, Peter／Kaufmann, Patricia A.／Lenz, Joann／Maifeld, Ron／Palazolo, Jerry／Perry, Michael／Powell, Peter W. W.／Pogue, Francis C.／Rogers, Michael／Scott, Terry／Spielberg, Richard／Stambaugh, Richard／Stoupe, Vernon, Jr.／Templin, Scott／Thedossiou, Marios／Undersander, Dan
