Report of the Naval Committee to the House of Representatives, August, 1850 [electronic resource] : in favor of the establishment of a line of mail steamships to the western coast of Africa, and thence via the Mediterranean to London; designed to promote the emigration of free persons of color from the United States to Liberia : also to increase the steam navy, and to extend the commerce of the United States : with an appendix added by the American Colonization Society