A dialogue concerning the slavery of the Africans : shewing it to be the duty and interest of the American states to emancipate all their African slaves / with An address to the owners of such slaves ; dedicated to the honourable the Continental Congress ; to which is prefixed, the institution of the Society, in New York, for promoting the manumission of slaves, and protecting such of them as have been, or may be, liberated. Norwich [Conn.]: Printed by Judah P. Spooner, 1776.