Nobel Peace Prize honoree Mother Teresa, legendary actress Katharine Hepburn, Negro Leagues Baseball and Cowboys of the Silver Screen are among the subjects headlining the 2010 stamp program, the U.S. Postal Service announced recently.

In addition, consumers get much-needed assistance in sending greeting cards with last month's issuance of the Monarch butterfly stamp, the first stamp designed especially for oversized or odd-sized cards. The Katharine Hepburn stamp was also issued in May.

Cowboys of the Silver Screen stamps were released in April, featuring William S. Hart (1864-1946), popular silent film era actor; Tom Mix (1880-1940), Western film star of the 1920s; Gene Autry (1907-1998), and Roy Rogers (1911-1998).

The Negro Leagues Baseball stamp is to be released this month. The Mother Teresa stamps are tentatively planned to go on sale Aug. 26, Mother Teresa's birthday.

Other stamps in this year's program are: Vancouver 2010 Olympic Winter Games; Lunar New Year; Distinguished Sailors William S. Sims (1858-1936), Arleigh A. Burke (1901-1996), John McCloy (1876-1945), and Doris Miller (1919-1943); Mackinac Bridge in Michigan; Bixby Creek Bridge in California; Pulitzer prize winner Bill Mauldin; Abstract Expressionists; set of four Flags of Our Nation; Love/Pansies in a Basket; Kate Smith (1907-1986) singer-entertainer whose signature song was "God Bless America"; pioneering filmmaker Oscar Micheaux; Sunday Funnies honors Archie, Beetle Bailey, Dennis the Menace, Garfield, and Calvin and Hobbes; Scouting; 19th century painter Winslow Homer; poet Julia de Burgos; Hawaiian Rain Forest; Holiday Evergreens; and, Angel with Lute.

The Postal Service receives no tax dollars for operating expenses, and relies on the sale of postage, products and services to fund its operations. For more information and low-resolution images of the 2010 series stamps, visit USPS Newsroom at