Clarence Gray Biographie Contributions de Clarence Gray Auteur Brick Bradford, 3 : Brick Bradford, (1934-1935) William Ritt, Clarence Gray Futuropolis Brick Bradford, 1 : Brick Bradford, (1938) Clarence Gray, William Ritt Futuropolis Brick Bradford, 2 : Brick Bradford, (1938-1939) Clarence Gray, William Ritt Futuropolis