The concept was inspired by a fictional book repository featured in The Abortion: An Historical Romance 1966 by cult American writer, Richard Brautigan. The novella’s main protagonist is a librarian who catalogues any book deposited in his care. All authors submitting unique titles, such as Growing Flowers by Candlelight in Hotel Rooms and The Culinary Dostoevski, are accepted and shelved. After Brautigan’s suicide, fans started real libraries of unpublished books."
Here it is.