United States cities with both extreme high and low values
for several factors relevant to the response to crime, as well as
"average" values for same.
All cities in the United States with a population over
50,000 in 1950, 1960, 1970 and 1975.
police department data, newspapers, ANNOTATED STATUTES,
United States Bureau of the Census data, Uniform Crime Reporting data,
United States Statistical Abstracts, City County Data Book (years 1950,
1960, 1970, and 1975)