1 Pybus, Cassandra Jane. Maxwell-Stewart, Hamish. American citizens, British slaves : Yankee political prisoners in an Australian penal colony 1839-1850 / Cassandra Pybus and Hamish Maxwell-Stewart Carlton South, Vic. : 2002 Melbourne University Press xv, 270 p., [12] p. of plates : 0522850278 Includes index. Bibliography: p. 256-265.