https://data.cityofchicago.org/Public-Safety/Crimes-2001-to-present/ijzp-q8t2/data
https://data.montgomerycountymd.gov/Public-Safety/Crime/icn6-v9z3/data
http://onlinelibrary.wiley.com/doi/10.1111/j.1740-9713.2016.00960.x/full
https://www.cityofchicago.org/content/dam/city/depts/doit/general/GIS/Chicago_Maps/Citywide_Maps/Community_Areas_W_Numbers.pdf