Penobscot Marine Museum’s summer season is in full swing and there are several events this week on the downtown campus.

On Thursday, June 23, at 5:30 p.m., there will be an authors talk and book signing in the Carver Memorial Gallery, 11 Church St. Historians Libby Bischof, Susan Danly and Earle G. Shettleworth Jr. will present their book “Maine Photography: A History, 1840-2015,” which explores the origins of Maine's rich photographic traditions; the rise of a fine-art photographic tradition; and the evolution of a thriving contemporary photo scene. The book is part of the Maine Photo Project. Admission to this event is free; for more information, call 548-0334.

On Saturday, June 25, from 8:30 a.m. to 3 p.m., the Maine Antique Paper Show returns to Penobscot Marine, running 8:30 a.m. to 3 p.m. in the First Congregational Church Vestry, 11 Church St. The annual show includes thousands of vintage postcards, old maps, historic photographs, sheet music and paper ephemera. Free appraisals will be available from 1 to 3 p.m. Admission is $2 and includes $2 off a museum admission.

A sampling of historic images from the museum’s collection of more than 140,000 photographs will be available. In connection with this year's show, Libby Bischof, associate professor of history and department chair at the University of Southern Maine, will be conducting her Maine Postcard Project on the museum’s campus from 10 a.m. to 5 p.m. Attendees will be able to write postcards to friends and family using postcards designed by Bischof featuring historic and contemporary images of Maine. For more information, call 548-0334.

The Friendship Sloop Lecture with Harold Burnham will be presented Monday, June 27, at 7 p.m. in the Carver Memorial Gallery, 11 Church St. Friendship Sloop builder Burnham and members of the Friendship Sloop Society will discuss the evolution of this iconic sloop design, from the workhorse of the Maine lobstering fleet to a beloved recreational sloop prized by traditionalists.

The lecture is part of Penobscot Marine’s Maine Maritime Icons Series. Cost is $8, $5 for members and for Searsport residents. For advance ticket purchase or more information, call 548-0334.

Courier Publications’ A&E Editor Dagney C. Ernest can be reached at (207) 594-4401, ext. 115; or dernest@courierpublicationsllc.com.