化學命名原則（修訂） Principles of Chemical Nomenclature, revised, 1945
Ministry of Education, Republic of China
Minor revision: 氡 for radon, 鈮 replacing columbium 鈳, 釓 for gadolinium.
Forms attested here (3)
- 鈮 Niobium Nb ní today 铌 ní niobium replaced columbium survives
- 釓 Gadolinium Gd gá today 钆 gá formally adopted survives
- 氡 Radon Rn dōng today 氡 dōng replaced an earlier term survives