The danger quotient
By: by Annabel and Edgar Johnson.
Contributors: Johnson, Edgar, 1912-
Edition: 1st ed.
Publisher: Harper & Row
Published: 1984
Place of publication: New York
Language: eng
Number of pages: 216
Subjects: Time travel -- Juvenile fiction; Science fiction -- Juvenile fiction
Genres: Juvenile fiction
Description: A super-genius in a small underground colony of survivors of nuclear war, eighteen-year-old Casey risks journeying back to the twentieth century to discover why the survivors are dying and how he can save them all.
Notes: paperback