YEAR BOOK OF THE ANNUAL ARCHITECTURAL EXHIBITION, PHILADELPHIA 1928

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

cracked : In reference to a hinge or a book's binding, means that the glue which holds the opposing leaves has allowed them to separate, revealing the stitching or binding underneath.

4to : Or quarto. A term used generally to describe the approximate size of a book, a book that is about 10" to 12" tall and roughly squarish in shape. The term is based on the size of paper traditionally used by book printers which has been folded and cut into 16 pages.