Southworth, G. V. D., & Southworth, J. V. D. (1946). Early days in America: The period of exploration, the thirteen colonies, the intercolonial wars, the struggle for independence, the adoption of the Constitution, and our country's growifng frontiers. Iroquois Publishing Co..

Southworth, Gertrude Van Duyn, and John Van Duyn Southworth. Early Days in America: The Period of Exploration, the Thirteen Colonies, the Intercolonial Wars, the Struggle for Independence, the Adoption of the Constitution, and Our Country's Growifng Frontiers. Syracuse, N.Y. : New York [etc.]: Iroquois Publishing Co., 1946.

Southworth, Gertrude Van Duyn, and John Van Duyn Southworth. Early Days in America: The Period of Exploration, the Thirteen Colonies, the Intercolonial Wars, the Struggle for Independence, the Adoption of the Constitution, and Our Country's Growifng Frontiers. Iroquois Publishing Co., 1946.