How well do you know the U.S. and Colorado constitutions? September 17 is nationally recognized as Constitution Day, a day that encourages learning and familiarity with the Constitution. The Colorado Secretary of State's Office publishes a booklet containing the Colorado and U.S. Constitutions, which they update whenever changes are made. In our library you can find the past editions of these booklets, to compare and see how these documents (especially the Colorado Constitution) have changed over the years. Also in our library you can find historical documents relating to the State Constitution, including a printing of the original 1876 Colorado Constitution and the Proceedings of the Constitutional Convention of 1875. Search our web catalog for more resources on the State and U.S. constitutions.