The Edward Strong Clark Papers contain correspondence and other work related papers. All of the materials related to Clark's interest in all things nautical. It originally thought that his photographs went to the Peabody Museum; however, that cannot be confirmed at this time. This collection has been divided into two series.

Series I. Correspondence consists of personal letters received by Clark, those from marine compiler Frederick C. Matthews, and those from marine artist Charles R. Patterson. There is also correspondence from a photographic print dealer.

Series II. Other contains notes to Clark from George Francis Dow of the Marine Research Society, regarding prints ordered, and a list of those prints. Also included is a proposal for establishing a maritime museum in San Francisco. This series also contains material related to the American Neptune, including correspondence about a meeting, meeting agenda, and report. There are also typescripts related to a variety of subjects, including an introduction to Frederick C. Matthews' book American Merchant Ships, with annotations and corrections, research notes such as descriptions of vessels, and reminiscences of a Bath, Maine sea captain. All of the typescript material appears to have been typed by Frederick Matthews.