Sec. 5. RECORDING DEEDS, MORTGAGES, ETC.; EVIDENCE; FORCE AND EFFECT. All deeds, mortgages, contracts and instruments of every nature, or in case of loss of any such instrument a certified copy from the record in the Oklahoma County may be so used, affecting the title to said lands, or that would have formed a part of the chain of title to the same under the laws of the State of Oklahoma, and now of record on the public records of the State of Oklahoma, may be filed and recorded in the county in Texas in which the land is now located. All deeds, mortgages, conveyances and all other instruments which would be valid under the laws of the State of Oklahoma and admissible in evidence under the laws of said State, shall be valid in Texas and shall be admissible in evidence in any court in this State, and copies of said instruments certified as provided by the laws of Oklahoma, as well as the originals thereof, may be introduced in evidence in the same manner as if executed with the formalities required by the laws of the State of Texas, and as if certified as required by the laws of this State. All such deeds, deeds of trust, mortgages, conveyances and contracts, affecting the title to any of said lands shall be given the same force and effect in the State of Texas as same would have been given in the State of Oklahoma, and all bona fide liens, incumbrances, or debentures, now outstanding and unsatisfied, and existing against said lands at the time of the rendition of said decision of the Supreme Court of the United States are here expressly validated, save and except as to purchase money due to the State of Oklahoma, or the United States, and except taxes, general or special, due to the State of Oklahoma, or any city, county, school district or other political subdivision of the State of Oklahoma. In determining whether any lien against said land shall be enforced, the period of time intervening between the rendition of the decision by the Supreme Court of the United States and the issuance of a patent to the land involved by the State of Texas, shall not be computed in applying the Statutes of Limitation of either the State of Oklahoma or the State of Texas, and this Act shall be liberally construed in the enforcement of liens against said land, it being the intention of the Legislature that all sections and parts hereof are independent of each other, and if any section or part hereof be held unconstitutional such invalid section shall not affect the remaining sections or parts hereof.