The Charles Butt Ballard Negative Collection. Black and white photo. Dragger Joseph S. Mattos at Southwest Harbor Boat Corporation. Cut in half for lengthening.
W.H. Ballard , “Joseph S. Mattos, Dragger,” Mount Desert Island Historical Society, accessed November 21, 2024, https://mdihs.digitalarchive.us/items/show/5380.Item 5746
