Cancels are either obtained in the city of the event (such as Kitty Hawk for the Wright Brothers first flight anniversary) or, for larger quantities of envelopes, from a special cancellation unit maintained by the Postal Service in Kansas City, Missouri.
cover version | cover | Cover version | Cretaceous–Paleogene extinction event | Impact event | Cover Drive | Yanni Live! The Concert Event | Tunguska event | Saturday Night's Main Event | Under Cover of Darkness | The Airborne Toxic Event | Permian–Triassic extinction event | 2012 PDC European Tour Event 5 | You Can't Judge a Book by the Cover | Tragedy (event) | ''The Main Event'' | The cover of ''Free to Choose | men's skeleton event | men's singles event | Mary Cover Jones | Major sports event hosting in Britain during the 2010s | List of images on the cover of Sgt. Pepper's Lonely Hearts Club Band | I Cover the Waterfront | Deep Cover | Cover of ''The Beautiful Boy'', showing Björn Andrésen | Cover My Song | cover (music) | Complex event processing | Bridge of Flowers (event) | 2009 Jupiter impact event |