Freeman, Frederic W. Mother Goose Comes to Portland. Southworth (1918). The First Hundred Years
Mower, Walter Lindley. Mower Family History. Southworth (1923). A Genealogical Record of the Maine Branch of this Family Together with Other Branches of the Family Tree.
Santayana, George. Lucifer or the Heavenly Truce. Southworth (1924). A Theological Tragedy
Coleman, Emma Lewis. New England Captives Carried to Canada. Southworth (1925). Between 1677 and 1760 During the French and Indian Wars
Johnson, Alfred. Ships and Sailing. Southworth (1925). A Collection of Pictures Including Many American Vessels. Painted By Antoine Roux and His Sons
Chase, Edward E. Maine Railroads. Southworth (1926). A History of the Development of the Maine Railroad System
Davis, Charles G. Ships of the Past. Southworth (1929). Marine Research Society
Dickinson, Emily. Unpublished Poems of Emily Dickinson. Southworth (1932). Hargaret Higginson Barney; Frederic Ives Carpenter
Barry, William. A Stroll Thro' The Past. Southworth (1933). Accompanied By an Invicible Associate, and Using an 18th Century State-Route and River Ford, Preceded By a Summary of the Early Ownerships and Provincial Governents of Maine (Kennebunk, Maine)
Rosenbach, A S W. Early American Children's Books. Southworth (1933). With Bibliographical Descriptions of the Books in his Private Collection. Foreword by A. Edward Newton.
Stone, George Cameron. A Glossary of the Construction Decoration and Use of Arm and Armor. Southworth (1934). In All Countries and in All Times Together with Some Closely Related Subjects