Book slip

Book slips or book order slips , as they were originally called, have been permitted in domestic traffic for printed matter fees since October 25, 1871. Book slips are preprinted slips of paper or cards for ordering, unsubscribing or offering bookseller works, books, magazines, pictures and sheet music. It was only allowed to add information that was used to describe the ordered or offered works. There were deviations from this, so book slips were sometimes viewed as printed matter .

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 Wikisource: Leaflet  - Article of the 4th edition of Meyers Konversations-Lexikon