Pīnyīn Rìjì Duǎnwén
Bǎnqiáo Shì, Táiwān: Pinyin.Info, 2010
Other than one introductory letter, this book of short stories is entirely in Mandarin. It does not, however, contain so much as one Chinese character; instead, it is written in Hanyu Pinyin.
Because of the generosity of the author, the text of the entire book is available for free on this site.
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