  1999 - Erdos on Graphs His Legacy of Unsolved Problems (Paperback) → Hardcover ISBN-13: 9781568811116 ISBN-10: 156881111X Genres: Science & Math, Engineering & Transportation ?  1998 - Erdos on Graphs His Legacy of Unsolved Problems (Hardcover) → Paperback ISBN-13: 9781568810799 ISBN-10: 1568810792 Genres: Science & Math, Engineering & Transportation ? |
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