Md. Code, Commercial Law § 17–407

(a) A museum may provide the notice required under this subtitle by publication if the museum does not:

(1) Know the identity of the lender or a designated agent of the lender;

(2) Know the address of the lender or a designated agent of the lender; or

(3) Receive proof of receipt of a notice that was sent by certified mail within 30 days after the notice was mailed.

(b) A notice by publication shall be published at least once a week for 2 consecutive weeks in a newspaper of general circulation in:

(1) The county in which the museum is located; and

(2) If the identity of the lender is known, the county of the lender’s last known address.