Colorado. Taxation. Sales tax Becomes effective Tuesday. Rm je 1, 1965 p.46 Colorado "use" tax or sales tax. Post Empire F 27, 1966 p.30,33 More and snore cities in state resorting to sales tax. Post o 31, 1968 p.58 Aurora hikes tax; other cities may follow suit. WN Ag 27, 1969 p.8 Colorado Supreme Court upholds home rule cities sales tax of insurance companies. RMN Ja 4, 1972 p.8 0