Old Mandarin

Tibeto-Mongol alphasyllabary/abugida used in China during Yuan Dynasty

1324 rime book by Zhou Deqing

speech of northern China during the time of the Jin and Yuan dynasties (12th to 14th centuries)

The Nogŏltae ('Old Cathayan') is a textbook of colloquial northern Chinese published in Korea in several editions from the 14th to 18th centuries. The book is an important source on both Late Middle Korean and the history of Mandarin Chinese. Later editions were translated into Manchu and Mongolian.

Chinese rime dictionary