Walton, Douglas N, Arguments from ignorance /Douglas Walton. - University Park, Pennsylvania : Pennsylvania State University Press, (c)1996. - xii, 313 pages : illistrations ; 24 cm. LCCN: 94045436 Subjects--Topical Terms: Reasoning.Ignorance (Theory of knowledge)Burden of proof. LC Class. No.: BC177 / .A748 1996 BC177