"Anyone who handles old books will have come across these small and sometimes beautiful labels pasted more or less discreetly into the endpapers. Publishers, printers, binders, importers, distributors and sellers of books -- new, second-hand and antiquarian -- used to advertise in this way." This site features images of hundreds of these labels from around the world. Browsable by name or location (such as California, Japan, and South America). From an enthusiast.