The neat duties (all discounts and abatements deducted) of all merchandize specified in the Book of rates : begun in the 12. of Car. 2. with several variations to this present year 1713, in vulgar arithmetick ... : and also the Turkey or Levant Company's duties, viz. impositions, consulage, how many hundred weight goes to a ton of each commodity, and the freight they usually have for the same tonnage ... /