(a) The petition shall be filed in the office of the county clerk of the county in which the district is located. If land in more than one county is included in the district, copies of the petition certified by the clerk shall be filed in the office of the county clerk of each county in which a portion of the district is located.
(b) The petition shall be recorded in a book kept for that purpose in the office of the county clerk.
(c) If more than one petition is filed and the petitions are identical except for the signature, one copy of the petition shall be recorded and all signatures on the other petitions shall be included.