共 28 条
[3]
BLALOCK HM, 1960, SOCIAL STATISTICS, P321
[4]
BOGUE DJ, 1953, POPULATION GROWTH ST, P10
[7]
ECKLER, 1958, B INT STATISTICAL I, V36, P12
[8]
FIREY W, 1950, HIGHWAYS OUR NATIONA
[9]
FLORENCE PS, 1955, METROPOLIS MODERN LI, P85
[10]
Galpin C. J., 1915, AGR EXPT STATION U W, V34