Maryland Code, State Government § 10-617

(1) a book, magazine, or newspaper;

(2) other library or museum material that was made or acquired for reference or exhibition purposes;

(3) an extra copy of a document that was kept only for convenience of reference;

(4) a stock of publications;

(5) an acceptance or refusal of an invitation or engagement of a public officer; and

(6) material that otherwise relates to personal business of a public officer.