I have had this small pamphlet in my angling library for many years. As you can see it cost a total of fifty cents back when it was for sale at Jack's Rod & Fly Shop in Roscommon, Michigan in the late 1960's.
As you can see from the cover it claims to contain the "Angling knowledge accumulated in 45 years of fishing," and "contains the knowledge of some of the nation's best fishermen." Quite a purchase for a mere fifty cents, however when you open it up the pages, all twenty of them, are blank!