Introduction (Forward in Time)
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Editions/Publications:
- Unknown. Forward in Time (Unknown, Ben Bova, Walker & Co., ISBN-10: 0802755623, $6.95, 234 pages, Hardcover, Collection)
- Unknown. Forward in Time (Unknown, Ben Bova, Popular Library, ISBN-10: 0445083107, $1.25, 285 pages, Paperback, Collection)
- Unknown. Forward in Time (Unknown, Ben Bova, Popular Library, ISBN-10: 0445083107, $2.75, 285 pages, Paperback, Collection)
- Unknown. Forward in Time (Unknown, Ben Bova, Walker & Co. / SFBC, $1.49, x+211 pages, Hardcover, Collection)
- Unknown. Forward in Time (Unknown, Ben Bova, Popular Library, C$1.25, 285 pages, Paperback, Collection)
- Unknown. Forward in Time (Unknown, Ben Bova, ReAnimus Press, ISBN-10: 9781540634498, $13.99, 286 pages, Trade Paperback, Collection)
- 2014 . Forward in Time (2014, Ben Bova, ReAnimus Press, $4.99, ebook, Collection)