"兜安氏止咳药，止咳，"Stop that Cough"!! You will- if you use DOAN'S cough lozenges." (2013) Chao Center for Asian Studies, Rice University[莱斯大学赵氏亚洲研究中心]; Shanghai Library[上海图书馆]: http://hdl.handle.net/1911/74923.
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