Maryland Code, Real Property § 3-304

(a) Except as provided in subsection (e) of this section, the clerk shall fasten securely one copy of each plat described under § 3-108 of this title in a book provided for that purpose or shall record the plat.

(b) The clerk promptly shall send one copy of each plat to the supervisor of assessments of the county and one copy, with one half of the filing fee, to the State Archivist, who shall number and file the plat as part of the records of the State Archivist's office and shall notify the clerk of the number given.

(c) The State Archivist shall mail or deliver, free of cost, to any supervisor of assessments of the State, a copy of the plat on request.

(e) In Montgomery County, the clerk may record or maintain the plat in electronic form in a manner approved by the State Archivist.