Search Results Use the search box below to revise your search, or start a new search. Studies (2) Variables Publications Your query returned 2 studies. Sort by: Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. 1. Quantifying the Size and Geographic Extent of CCTV's Impact on Reducing Crime in Philadelphia, Pennsylvania, 2003-2013 (ICPSR 35514) Ratcliffe, Jerry; Groff, Elizabeth 2. Research on Pathways to Desistance [Maricopa County, AZ and Philadelphia County, PA]: Subject Measures - Scales, 2000-2010 (ICPSR 36800) Mulvey, Edward P.