Libraries on Cinderellas

Stamp collectors refer to pseudo stamps or labels with no postal value as "cinderellas". I have a small collection of library cinderellas which is shown below.

Boston Public Library

Erie (PA) Public Library

New York University Library (now Hall of Fame)

Springfield (VT) Public Library

Columbus (OH) Public Library 

St. Paul (MN) Public Library

New York Public Library

New York Public Library 

Riverside (CA) Public Library