Postal service. Denver Problems of delivering mail in high-rise buildings cited. Post Je 22, 1969 P-33 Zip code speeds the mails. Post Ag 3, 1969 p.41+D Postal strike threatened. Post Mr 19, 1970 p.1,3,36 Local mail carriers to honor picket lines and work stops. Post Mr 21, 1970 p.1 A Denver walk-out spreads through state. RMN Mr 22, 1970 p 5,8 Post Mr 22, 1970 p.2
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