Wyo. Stat. Ann. § 1-12-201

Printed copies of schedules, classifications and tariffs of rates, fares, charges, rules and regulations and supplements thereto, filed with the interstate commerce commission or the public service commission, which show respectively an interstate commerce commission number and an effective date or a public service commission number and an effective date, may be received in evidence without certification and shall be presumed to be correct copies of the originals on file with the interstate commerce commission or on file with the public service commission.