References/Notes/Attributions:
Source
World Almanac and Book of facts 1975. (Crime rates).
Statistical Abstracts of the United States 1975, p.20, (Urban rates), possibly available as https://books.google.ch/books?id=zl9qAAAAMAAJ&pg=PA20.
References
McNeil, D. R. (1977) Interactive Data Analysis. New York: Wiley.
See Also
The state data sets.