Between the Planets by RobertA. Heinlein Paperback, 174 Pages, Published 1987 by New English Library Ltd Import ISBN-13: 978-0-450-03584-5, ISBN: 0-450-03584-0
Revolt in 2100(Updated) by RobertA, Robert Anson Heinlein Paperback, 208 Pages, Published 1985 by New English Library Ltd Import ISBN-13: 978-0-450-01033-0, ISBN: 0-450-01033-3