1984 - The Comet Book a Guide for the Return of Halley's Comet (Other) → Paperback ISBN-13: 9780867200294 ISBN-10: 0867200294 Genres: Science & Math, Engineering & Transportation 1 1982 - Introduction to Comets (Paperback) → Hardcover ISBN-13: 9780521272186 ISBN-10: 0521272181 Genre: Science & Math ? |