1. Cost of Food Basket in Urban Areas of the People's Republic of China
2. Needless to say, the views expressed in this report are mine alone; I do not mean to implicate other members of the delegation, much less the Committee on Scholarly Communication. An abridged version of this paper will be included in the delegation's official report, Vegetable Farming Systems in the People's Republic of China, to be published by the National Academy of Sciences. That report will also include “The economics of municipal vegetable production in the PRC” by Thomas B. Wiens.
3. Record harvest of spring vegetables on Peking outskirts;NCNA-English (Peking),1973
4. The theoretical effect of city size on the width of the inner zone, holding regionally specific factors constant, may be indicated by means of a simple model. Assuming (1) that the shapes of both the city proper and its surrounding inner zone are circular, (2) that the population density within the urban area is 20,000 persons per sq. km., (3) that one-fifth of the total area of the inner zone is devoted to vegetable cultivation, and (4) that annual yield of that vegetable land is 60 tons/ha., then the theoretical width of the inner zone would vary by city size as follows: 0·5 million: 2·84 km, 1 million: 4·02 km., 2 million: 5·68 km., 3 million: 6·96 km., 4 million: 8·04 km., 5 million: 8·99 km., and 6 million: 9·85 km.