Colorado. General assembly. 1977-1978 Senate gives initial approval to a "Tax shift" pkg. Food tax credit involved. Post Je 3, 1977 p.1 FM Je 3, 1977 P-5 Gov. Lamm vetoes railroad tax change. Discussion of other vetoes in current legislative session. RMN Je 4, 1977 p.46 Post Je 3, 1977 p.3 Legislature approves car exhaust check plan in 9 heavily populated Colo. counties. Post Je 4, 1977 P-32 RMN Je 4, 1977 p.8 0