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List of Circa-1950 Police Signal Codes
(Dec 1969) : 2. Record Number: D0000895
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List of Signal Codes
"National APCO," (Dec 1969) Record Number: D0000636
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Officers Manual
(Dec 1969) : 145. Record Number: D000163
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Minutes of October 6, 1976 Board Meeting
Executive Director, (Dec 1969) : 3. Record Number: D0001321
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Cover Page
Editor, "Public Safety Communications," 87, no. 3 (Jul 2021) : 1. Record Number: A6047
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