The Stonehenge gate /

Children of the gates /
by: Norton, Andre
Published: (2014)

Beneath the gated sky /
by: Reed, Robert, 1956-
Published: (1998)

Sacrifice on Spica III /
by: Brown, Eric, 1960-
Published: (2014)

Star gate /
by: Norton, Andre
Published: (1958)

Contact with chaos /
by: Williamson, Michael Z.
Published: (2009)

A planet called Treason /
by: Card, Orson Scott
Published: (1979)

Ugri︠u︡myí dudochnik /
by: Norton, Andre
Published: (1991)

(Peligrosos) invasores del espacio /
by: Melgar, Luis T. (Luis Tomás)
Published: (2002)

Wheelers /
by: Stewart, Ian, 1945-, et al.
Published: (2017)

Beyond Earth : the search for extraterrestrial life /
by: Gallant, Roy A.
Published: (1977)

World alone /
by: Rodgers, David Leigh
Published: (1974)

Improbable planet /
by: Vincent, William Shafer, 1907-
Published: (1976)

Exobiology /
by: Ponnamperuma, Cyril, 1923-
Published: (1972)

Lifecloud : the origin of life in the universe /
by: Hoyle, Fred, 1915-2001
Published: (1978)

The cosmic connection ; an extraterrestrial perspective /
by: Sagan, Carl, 1934-1996
Published: (1973)

Here be dragons : the scientific quest for extraterrestrial life /
by: Koerner, David
Published: (2000)

Cosmic life-force /
by: Hoyle, Fred, 1915-2001
Published: (1990)

Carl Sagan's cosmic connection : an extraterrestrial perspective /
by: Sagan, Carl, 1934-1996
Published: (2000)

George Hogglesberry : grade school alien /
by: Wilson, Sarah, 1934-
Published: (2002)

Omega /
by: McDevitt, Jack
Published: (2003)

Lady of mazes /
by: Schroeder, Karl, 1962-
Published: (2005)

The blue world /
by: Vance, Jack, 1916-2013
Published: (2005)

Maske : thaery /
by: Vance, Jack, 1916-2013
Published: (2005)

The man who fell to earth /
by: Tevis, Walter S.
Published: (2000)

Startide rising /
by: Brin, David
Published: (1983)

Engine city /
by: MacLeod, Ken, 1954-
Published: (2003)

Contact : a novel /
by: Sagan, Carl, 1934-1996
Published: (1986)

Rift in the sky : a novel of the Clan chronicles /
by: Czerneda, Julie, 1955-
Published: (2009)

Ragamuffin /
by: Buckell, Tobias S.
Published: (2007)

Fuzzy sapiens /
by: Piper, H. Beam
Published: (1976)

Halo : the Cole Protocol /
by: Buckell, Tobias S.
Published: (2008)

The tides of Kithrup /
by: Brin, David
Published: (1983)

Planet of adventure /
by: Vance, Jack, 1916-2013
Published: (1993)

Ecce and old earth /
by: Vance, Jack, 1916-2013
Published: (2002)

Throy /
by: Vance, Jack, 1916-2013
Published: (1993)

Marune : Alastor 933 /
by: Vance, Jack, 1916-2013
Published: (1984)