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The article presents abstracts of papers presented at the 47th annual meeting of the Association of American Geographers, held at Chicago, Illinois between march 19, 1951 and march 22, 1951. Lewis M. Alexander presents the paper Survey of Commercial Rivalry between the North Sea Ports of Belgium and the Netherlands. Homer Aschmann presents the paper Consumer-oriented Classification of the Products of Tropical Agriculture. Tracy B. Augur presented the paper on Regional-Urban Relationships. George Beishlag presented the paper on What Cartography Can Do for Geography Students.

The primary data for this paper, the self-descriptions of respondents from a delinquent gang of Negro boys, were obtained in a Chicago Park District field house. The boys lived in an adjacent public housing project and hung on the corner near the field house and in the playground. The data were collected by a Youth Studies Program staff member who had spent a number of days as an observer of the gang. He was assisted by the gang's detached worker. Following administration of the questionnaire to the gang boys, these men joined efforts and located 23 non-gang boys of similar ages, who also lived in the same project, to serve as control subjects. Administration required about an hour and a half; the paired comparison instrument in which we are primarily interested, about 20 minutes. [ABSTRACT FROM AUTHOR]

Regression upon principal components of the percentage points of the income and education distributions for 1950 census tracts in the city of Chicago led to the estimation of "beta coefficient profiles" for television receiver and refrigerator ownership, for central heating system usage, and for a measure of dwelling unit overcrowding. The betas are standardized coefficients of regression of a dependent variable upon the proportions of families in the classes of the marginal income and education distributions. They measure the relative contribution of families in these classes to the over-all per cent saturation of the dependent variable in the tract. The coefficients were estimated by techniques developed in the first portion of the paper; estimation by classical regression methods would have been impossible because of multicollinearity. The empirical results are in substantial agreement with findings from regressions of the dependent variables upon the mean values of income and education, and their squares. The statistical devices appear to be useful in exploratory empirical research. [ABSTRACT FROM AUTHOR]