Md. Code, Estates and Trusts § 12–103

Except as otherwise provided in this title:

(1) The administration on or after July 1, 1974 of estates of persons who died before July 1, 1974, shall be governed by those statutes in effect before July 1, 1974; and

(2) The administration on or after January 1, 1970 of estates of persons who died before January 1, 1970, shall be governed by those statutes in effect before January 1, 1970.