Colarado. taxation. Income-tax State income tax department has spent $20,000 since it was set up, July 1, 1937, Post, Feb. 10, 1938, p. 1 4 Colorado plans to tax incomes of performers visiting state. Post, Feb. 25, 1938, p. 11 Colorado hopes levy will yield $8,000,000 as Denverites flock to pay first state income tax, News, Feb. 2?, 1938, sec.2, p. 1 Some federal workers must pay state levy. Post, Mar. 12, 1938, .p. 4 1 ie