1 ) demonstrated an increasing trend from the center city areas in the north-central portions of the 19146 and 19147 ZCTAs to the outlying areas of the 19145 and 19148 ZCTAs.
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Lead exposure in childhood and historical land use: a geostatistical analysis of soil lead concentrations in South Philadelphia parks.
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Pb concentrations demonstrated a decreasing trend from areas with undeveloped/greenspace land use to areas with residential/commercial/unreported and industrial/manufacturing land use (Fig. 4 ).