One well known old surviving text is the Yuèfēng 粵風 book of folksongs from Guiping, published in the 18th century.
•
However there are major phonetic and lexical differences between Zhuang dialects, and the Latin-based system is based on the Wuming dialect; because of this and other reasons, there still are many Zhuang speakers that prefer to write Zhuang using sawndip.
•
One of the first systematic studies of Sawndip that covered more than one location was Zhang Yuansheng's 1984 examination of 1114 Sawndip, mainly from Wuming but also including some characters from 37 other locations.
•
Fwen Caeg "Songs of War" (Chinese: 贼歌 Zéi gē) from Pingguo which is consider it be such despite some lines which are later additions.