Countdown

by C B Colby and John Wyndham

Published 1 November 1970

Submarine

by C B Colby

Published 1 December 1953

Police

by C B Colby

Published 1 January 1971

Ships of Our Navy

by C B Colby

Published 1 December 1963

FBI

by C B Colby

Published 1 December 1970