The clove of commerce (Zanzibar and Pemba) : including cost and charges calculator in rupees and pence of a pound sterling, in rupeesand cents of an American dollar, at various rates of exchange, with moisture and extraneous matter tables, notes on handling charges, freight tables, arbitration tables, general produce brokers' association Zanzibar clove contract, American spice trade association arrival and spot contacts, and statistics of clove crops, exports and prices from 1895 to July, 1925 / by W. Grazebrook.