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1
Published 1980

Book
2
Published 1979

Book
3

Book
4
Published 1988

Book
5
by Olson, Richard, 1940-
Published 2010

Book
7
by Däniken, Erich von, 1935-
Published 1973

Book
8
Published 1968

Book
9

Book
10
Published 2006

Government Document Book
11
Published 1997

Book
12
Published 2002

Book
14

Book
16
by Tainter, Joseph A.
Published 1988

Book
17
by McKay, John P.
Published 1999

Book
18

Book
19
20
by Lissner, Ivar, 1909-1967
Published 1962

Book