The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 648:1977, Laboratory glassware — One-mark pipettes. ISO 1042:1983, Laboratory glassware — One-mark volumetric flasks. ISO 3081:1986, Iron ores — Increment sampling — Manual method. ISO 3082:1987, Iron ores — Increment sampling and sample preparation — Mechanical method. ISO 3083:1986, Iron ores — Preparation of samples — Manual method. ISO 3696:1987, Water for analytical laboratory use — Specification and test methods. ISO 7764:1985, Iron ores — Preparation of predried test samples for chemical analysis.