The World of Razor Sharpeners by Tom Willard. STROPPERS There are approximately 2000 known razor sharpeners/stroppers, not including leather strops, leather.
Chapter 7: User-Defined Simple Data Types, Namespaces, and the string Type.
C++ Programming: Program Design Including Data Structures, Fourth Edition Chapter 8: User-Defined Simple Data Types, Namespaces, and the string Type.