Royce, Kenneth. The XYY Man. [electronic resource] . — [1st American ed.]. — New York, : McKay, [1970]. — 191 p. 21 cm. LCCN: 76126060 //r94 Subjects--Topical Terms: Intelligence service--Fiction.--Great Britain Index Terms--Genre/Form: Spy stories. LC Class. No.: PZ4.R8892 PR6068.O98 / Xad3 Dewey Class. No.: 823/.9/14