Van Cleaf Bachman. Peltries or Plantations: The Economic Policies of the Dutch West India Company in New Netherland, 1623-1639. (The Johns Hopkins University Studies in Historical and Political Science, 87th Series [1969], Number 2.) Baltimore: Johns Hopkins Press. 1969. Pp, ix, 183. $7.50 and Michael Kammen. Empire and Interest: The American Colonies and the Politics of Mercantilism. (Pilotbooks; The Lippincott History Series.) Philadelphia: J. B. Lippincott Company. 1970. Pp. x, 186. Cloth $4.95, paper $2.95