Souvenir | souvenir | Antarctic ice sheet | sheet music | Cordilleran Ice Sheet | Youngstown Sheet & Tube Co. v. Sawyer | Sheet music | Youngstown Sheet and Tube | West Antarctic Ice Sheet | Souvenir (play) | Sheet Harbour, Nova Scotia | Sheet Harbour | Nippon Sheet Glass | The Dope Sheet | Style sheet language | Souvenir (Kristy Thirsk album) | Souvenir d'Italie | Souvenir de Florence | Smilers sheet | Sheet music cover for ''When You and I Were Young, Maggie'' (Oliver Ditson | Sheet music cover for ''When the Corn Is Waving, Annie Dear | Sheet music cover for ''The Cat Came Back | Sheet metal | Sheet bend | Portrait of D.F.E. Auber from sheet music for ''Lestocq'' (Boston: William H. Oakes | Plaque at the entrance to the cemetery. It reads 'Le Souvenir français | Model sheet | Exposure sheet | East Antarctic Ice Sheet | Assignment cover sheet |
Imperforate stamps have been issued occasionally since then, either because separation equipment was temporarily unavailable (in newborn nations for instance), to makers of automatic stamp vending equipment (the United States did this in the 1900s and 1910s), as novelties for stamp collectors (particularly when stamps are issued in souvenir sheets), or as errors.