The downtown Penobscot Marine Museum has announced Autumn Extras, a series of talks and tours designed to give visitors a richer, more educational museum experience. The presentations are led by museum professionals who will discuss exhibits and artifacts in depth or take visitors behind the scenes to explain museum procedures.

The programs will begin at 1 p.m. every weekday through Oct. 21, and are free with regular museum admission. Each weekday will feature a different subject.

Mondays will focus on Maine and the China trade. Education Director Betty Schopmeyer will discuss the maritime commerce that made Maine an international trading power in the 19th century.

Tuesdays will focus on small craft in Maine. Curator Ben Fuller will discuss the museum’s historic boat collection, one of New England’s largest.

Wednesdays will offer photography archives tours behind-the-scenes in one of Maine’s largest collections of historic photography with archivist Kevin Johnson.

Thursdays will offer object storage tours. Collections Manager Cipperly Good will take visitors behind the locked door to see objects in the new Seabag Visible Storage Center.

Fridays will focus on 75 years of collecting via a guided tour of “75 for 75,” the museum’s 75-item/75th-anniversary exhibit, by Good.

The schedule is subject to change. To confirm the day’s Autumn Extras program, call the Penobscot Marine Museum Admission Center at 548-0334.