Letter from MM. de Gasparin, Martin, Cochin, and Laboulaye, to the Loyal Publication Society of New York /
Reply of Messrs. Agenor de Gasparin, Edouard Laboulaye, Henri Martin, Augustin Cochin, to the Loyal National League of New York : together with the address of the League, adopted at the mass inaugural meeting, in Union Square, April 11, 1863.