共 50 条
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- [45] Preparation and testing of hydrogen of high purity JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY-US, 1919, 11 (05): : 961 - 963
- [46] PREPARATION OF HIGH-PURITY NAPHTHALENE JOURNAL OF APPLIED CHEMISTRY OF THE USSR, 1977, 50 (04): : 840 - 843
- [48] Preparation of benzoic acid of high purity JOURNAL OF RESEARCH OF THE NATIONAL BUREAU OF STANDARDS, 1940, 25 (06): : 747 - 757