Recollections of a New York chief of police an official record of thirty-eight years as patrolman, detective, captain, inspector, and chief of the New York police - Walling, George Washington (Specially issued for the benefit of the Denver Police Mutual Aid Fund, 1890)
Includes (p. [609]-675): Historic supplement of the Denver Police : a review from earliest days to the present time / by A. Kaufmann. - OCLC, 31857349. - Reproduction of original from Harvard Law School Library