Author: Walker, E.H., 1941.:
Title: Plants collected by R.C. Ching in Southern Mongolia and Kansu Provinces, China. [Contr. U.S. Natl. Herb., 28(4).]
Description: Washington. Pp. i-vi,563-675,vii-xiii, 1 map, 6 pls. of photos, index. Orig. wrs.

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