The Standard Dictionary of Facts was a single volume general encyclopedia that was published from 1908 to 1924 on an annual basis by the of Buffalo. It was in some ways a predecessor to that firm's much more famous Lincoln Library of Essential Information. The first edition was edited by , who had previously edited the Century Book of Facts. Ruoff association with book was evidently terminated sometime in 1916 or 1917, because, though he is credited as the editor of the 1916 edition he is only credited as the editor of the first edition in 1917 and not mentioned in subsequent editions.