The Shell Money of the Slave Trade - Jan Hogendorn, Marion Johnson - Google Books

https://books.google.de/books?id=Uhq94TIsRQwC&dq=shell+money+cowry+cowries

This study examines the role of cowrie-shell money in West African trade, particularly the slave trade. The shells were carried from the Maldives to the Mediterranean by Arab traders for further transport across the Sahara, and to Europe by competing…