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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Books for stamps. 6 letters:

ALBUMS: Books for stamps.
ALBUM: Stamp book
DUEBY: Library book stamp
DATER: Librarian's book-stamping gadget
DUEDATE: Stamp in a book
GWTW: Book on the Celebrate the Century stamp sheet with FDR