national-cryptologic-museum-library-catalog_page_228

national-cryptologic-museum-library-catalog | page 228 | https://thedailydialectics.com/pdfs/FIOA/national-cryptologic-museum-library-catalog/national-cryptologic-museum-library-catalog.pdf

HOPKINS, ALBERT A. THE SECRET LOCK AND THE LETTER LOCK. IN: THE LURE OF THE LOCK (GENERAL SOCIETY OF 1928 MECHANICS AND TRADESMEN. HE7676.H77 1938 HOPKINS, C.W., MEISENBACH, |"ACE" COMPLETE CHECKING SYSTEM FOR THREE CHARACTER CODES HOPKINS, C.W. 1938 |A.C., MITCHEL, W.J. HOPKINS, HARRY REPORT OF…