The Official Guide of the Model Railways of the United States, Puerto Rico, Canada, Mexico and Cuba

boards : Common term for the covers of a hardbound book.

rubbing : Abrasion or wear to the surface. Usually used in reference to a book's boards or dust-jacket.

octavo : A book whose page size is approximately 12 inches by 9 inches. The size is based on a sheet of paper 25 inches by 38 inches, the size of paper traditionally used by book printers, which has been cut into eight pages.

tight : Used to mean that the binding of a book has not been overly loosened by frequent use.

soiled : Generally refers to minor discoloration or staining.