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. Author manuscript; available in PMC: 2012 Aug 6.
Published in final edited form as: J Obstet Gynecol Neonatal Nurs. 2011 Sep-Oct;40(5):544–554. doi: 10.1111/j.1552-6909.2011.01273.x

Figure 1.

Figure 1

Environmental stress in Philadelphia by census tract.