Kaartsysteem (hagers)
Kaartsysteem (hagers) - Zie verder: J. Hagers en anderen. Het kaartsysteem Van der Laan & Co. ’s Gravenhage f 0.90. In luxe band f 1.50. — Byles, R. B., The Card Index Sysem ; its principles, uses, operation and component parts. Pitman. 1 sh. net. — Edward A. Cope, Filing Systems. 2s. 6d. net. — J. Kaiser. Systematic Indexing. 12s. 6d. net....
