severance_23's photos with the keyword: roger longrigg

First published in hardback by Michael Joseph (U.K.) and St. Martin's Press (U.S.) in 1976. This U.S. paperback edition published by Dell (ISBN: 044018598X) in January 1980. Cover art is not credited, though the initials J.L. can be seen on the cover.

First published in hardback by Michael Joseph (U.K.) and St. Martin's Press (U.S.) in 1978. This U.S. paperback edition published by Dell (ISBN: 0440181895) in February 1980. Cover art is not credited, though the initials J.L. can be seen on the cover.

First published in theU.K. by MacMillan (hardback) in 1973. This U.S. paperback edition published by Pyramid (ISBN: 0515033677) in June 1974.

First published in the U.K. by Macmillan & Co. (hardback) in 1970. This paperback edition published by Mayflower (ISBN: 0583119352) in 1971. Ivor Drummond was a pseudonym of Roger Longrigg.