Colo. Rev. Stat. § 35-43-108
It is the duty of the state board of stock inspection commissioners, from time to time as it may be necessary, to cause to be published in book form a list of all brands on record at the time of such publication. The board, at its discretion, may cause to be issued a supplement to the brand book issued, containing the additional brands or changes in ownership of brands between the time of the last publication and the time of issuing such supplement, for the use of the department and its employees. Such brand book and supplements thereto shall contain a facsimile of every brand recorded, together with the owner's name and post-office address. Said records shall be arranged in convenient form for reference. Said books and supplements may be sold to the general public at approximate cost. The brand book and other publications circulated in quantity outside the executive branch shall be issued in accordance with the provisions of section 24-1-136, C.R.S.
C.R.S. § 35-43-108