Numismatic Literature，Zheng, Jiaxiang, History of Ancient Chinese Currency Development (Zhongguó gudài huòbì fazhan shi), Beijing, 1958, 202 pages, softcover, covers Warring States round coins, spade money, knife money, etc., text in Chinese, ex. H. F. Bowker Numismatic Library. Howard Franklin Bowker (1889-1970) was a numismatist and philatelist, collecting and specializing in Chinese coins, stamps and banknotes. He created the first bibliography of Western language publications on East Asian numismatics.
