Allkofer, Otto Claus. Spark chambers / by Otto Claus Allkofer, under cooperation of Wol f-Dieter Dau and Claus Grupen. - Munchen : K. Thiemig ; [1969]. - x, 247 p. : illus. ; 24 cm. Includes bibliographical references. Subjects--Topical Terms: Spark chamber. Dewey Class. No.: 539.77 ALL