Chisholm, Anthony H2017-05-302017-05-301975b1203862http://hdl.handle.net/1885/117102The research reported here is mainly composed of a collection of papers published over the period 1971-75. There is an inevitable temptation in a submission of this type to supplement and make additions to the published studies, particularly in those instances where a period of several years has elapsed since the date of publication of a paper. However, with only two exceptions which are discussed below, I have chosen not to modify or add to the papers which have been published or are in the course of publication.1v. (various pagings)enAgriculture Economic aspectsNatural resources197510.25911/5d7240335b9502017-05-19