A Collection of United States Commemorative, Special Delivery and Airmail Stamps 1901-1952 coomprising:a set of six 1901 Pan-American Issue 1, 2, 4, 5, 8 and 10-cent stamps, a vertical block of three 1922 Special Delivery 10-cent stamps.a 1922 Special Delivery 15-cent stamp,a vertical pair of 1922 Special Delivery 20-cent stamps, four 1924 Theodore Roosevelt 5-cent stamps, a horizontal block of three George Washington 2-cent stamps,a 1929 Ohio River Canalization 2-cent stamp, a 1932 George Washington Bicentennial 5-cent stamp, a block of four 1932 Arbor Day 2-cent stamps,a block of eight 1933 Fort Dearborn 1-cent stamps, a block of eight 1933 Federal Building 3-cent stamps,two singles and a vertical pair of 1931 air post 5-cent stamps,a 1934 air post 6-cent stamp,a 1938 George Washington 1-cent stamp,a block of six 1938 John Adams 2-cent stamps,a horizontal pair of 1938 Thomas Jefferson 3-cent stamps,a vertical block of three 1941 air-post 6-cent stamps, a horizontal pair of 1941 air post 8-cent stamps,a horizontal pair of 1941 commemorative Win the War 3-cent stamps,a horizontal pair of 1942 War Savings Bond 25-cent issue stamps,a 1946 commemorative Merchant Marine: Peace and War 3-cent stamp, a plate-block of four 1951 John Sloan 8-cent stamps,a horizontal pair of 1952 air post 7-cent stamps,together with a presentation booklet of 50 stamps from the 1931 Pan-American Congress in Madrid.