Gwoyeu Romatzyh
The (1937) "Guoyu cidian" (國語辭典 "Dictionary of the National Language") was a four-volume dictionary of words, designed to standardize modern pronunciation. The main entries were characters listed phonologically by Zhuyin Fuhao and Gwoyeu Romatzyh. For example, the title in these systems is ㄍㄨㄛㄩ ㄘㄉ一ㄢ and Gwoyeu tsyrdean.