time travel story, future society sends "characters" back to collect historic artifacts and or documentation from history. this story topic is a undocumented speech by Abraham Lincoln.
Editions · 4
Hardback
1977 · Victor Gollancz
EN
9780575022973
Paperback
1977 · Ace Books
192 pp · EN
9780441484218
Paperback
1979 · Coronet
190 pp · EN
9780340238387
Paperback
1990 · Baen
208 pp · EN
9780671721084
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