Year book of the State of Colorado

text file, 1st (1918)-22nd (1948/1950)., "Detailed information regarding the state, its resources, opportunities and attractions, compiled from official and semi-official sources and published under the authority vested by the state legislature in the State Board of Immigration.", Vols. for 1918-1933/1934 issued by the State Board of Immigration; 1935-1948/1950 issued by the Colorado State Planning Commission.