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Any of the koan collections immediately spring to mind - the Mumonkan, the Blue Rock Record, Entangling Vines, etc. Other than those, a number of famous Zen teachers wrote substantial bodies of work. Hakuin, Huineng, Seng t'san, and even Bodhidharma all have works attributed to them (prior to the 18th century, whether they themselves actually wrote those texts is a matter of debate). Just look up any of the key Zen personalities in a university library catalog and see if they wrote anything.
And geez, Shobogenzo? I'd rather have my gums scraped! Dogen can be monumentally obtuse! π