Chinese Literature - Hongwu zhengyun 洪武正韻 (www.chinaknowledge.de)

http://www.chinaknowledge.de/Literature/Science/hongwuzhengyun.html

The Hongwu zhengyun 洪武正韻 is an character dictionary from the Ming period whose words are arranged according to rhyme groups. It was compiled under the supervision of Le Shaofeng 樂韶鳳 and Song Lian 宋濂