Original set was to contain 12 vols. with v.9 titled "Machining processes", v.11 titled "Production engineering", and v.12 titled "Precision measurement". Vols. 9 and 12 were never published and the existing vol. 11 was renumbered to vol. 9 in some later printings. and Translation of Handboek van de fijnmechanische techniek.