Alaska Stat. § 19.30.090
The cost of constructing access roads to state land shall be paid in freely transferable land credit certificates which may be applied toward the purchase or lease of any state land under the jurisdiction of the division of lands, except tide, submerged, and shoreland and land belonging to the state which have been obtained by escheat, purchase, or any means other than by general land grant. A land credit certificate is valid for a period of 20 years after issue. After the expiration of 20 years from date of issue the holder may not start an action against the state or any person based upon the certificate. The method of disposing of land and resources and restrictions upon their disposal established by law or regulation are in no way affected by the use of land credit certificates.
AS 19.30.090