共 25 条
- [1] A COMPARISON OF THE ECONOMICS OF PEEK-A-BOO, EDGE-PUNCHED, AND NORMAL CARD SYSTEMS NACHRICHTEN FUR DOKUMENTATION, 1963, 14 (02): : 65 - 72
- [2] EDGE-NOTCHED CARDS OR PEEK-A-BOO CARDS FOR DOCUMENTATION NACHRICHTEN FUR DOKUMENTATION, 1967, 18 (02): : 53 - 53
- [5] COMBINED APPLICATION OF A PEEK-A-BOO CARDS AND EDGE NOTCHED CARDS FOR DOCUMENTATION OF BIOLOGICAL OBJECTS NACHRICHTEN FUR DOKUMENTATION, 1967, 18 (05): : 185 - 185