The filing of such request for publication shall be accompanied by an affidavit or affidavits of a person or persons over twenty-one years of age setting forth that the affiant or affiants have examined the lands involved in a reasonable effort to ascertain whether any person or persons were in actual possession of or engaged in the working of such lands or any part thereof, and, if no person or persons were found to be in actual possession of or engaged in the working of said lands or any part thereof, on the date of such examination, setting forth such fact, or, if any person or persons were so found to be in actual possession or engaged in such working on the date of such examination, setting forth the name and address of each such person, unless affiant shall have been unable through reasonable inquiry to obtain information as to the name and address of any such person, in which event the affidavit shall set forth fully the nature and results of such inquiry.
The filing of such request for publication shall also be accompanied by the certificate of a title or abstract company, or of a title abstractor, or of an attorney, based upon such company's abstractor's or attorney's examination of those instruments which are shown by the tract indexes in the county office of record as affecting the lands described in said request, setting forth the name of any person disclosed by said instruments to have an interest in said lands under any unpatented mining claim heretofore located, together with the address of such person if such address is disclosed by such instruments of record. "Tract indexes" as used herein shall mean those indexes, if any, as to surveyed lands identifying instruments as affecting a particular legal subdivision of the public land surveys, and as to unsurveyed lands identifying instruments as affecting a particular probable legal subdivision according to a projected extension of the public land surveys.
43 C.F.R. §3712.2-2