Two books on opium weights and traditional Asian currency: 'Sammlung Köhler-Osbahr. Band II/1 Vormünzliche Zahlungsmittel und Aussergewöhnliche Geldformen aus China, Annam, Korea und Japan', Stadthistoriches Museum, Duisburg, 1993 (text in German) and Rolf und Ilse Braun, 'Opium Gewichte/Opium Weights/Poids d'Asie', Landua, 1983 (text in German, English and French). Both quite hard to find.
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