When did Kim Stanley Robinson publish the first book in the Mars trilogy?
1993
1971
1971
1979
1991
1999
1992
1971
1979
1991
1999
1992
1971
1979
1991
1999
1992
1998
1972
1971
1995
1990
1979
1991
1999
1992
1998
1972
1971
1995
1990
1979
1991
1999
1992
1998
1972
1971
1995
1990
1979
1973
1991
1999
1992
1998
1972
1971
1995
1990
1979
1973
1991
1999
1992
1998
1972
1971
1995
1990
1979
1973
1991
1996
1999
1992
1998
1972
1971
1984
1995
1990
1979
1973
1991
1996
1999
1992
1998
1972
1997
1971
1984
1988
1995
1970
1990
1979
1973
1991
1996
1999
1992
1998
1972
1997
1971
1984
1988
1995
1970
1990
1979
1973
1991
1996
1999
1992
1998
1972
1997
1971
1984
1988
1995
1969
1970
1990
1979
1994
1973
1991
1996
1999
1992
1998
1972
1997
1971
1984
1985
1988
1995
1969
1970
1990
1979
1994
1973
1991
1983
1996
1999
1992
2001
1998
1972
1997
1981
1971
1984
1985
1988
1995
1969
1970
1990
1979
1994
1973
1991
1977
1983
1996
1999
1992
2001
1998
1972
1997
1981
1971
1984
1985
1988
1995
1969
1970
1990
1979
1994
1973
1991
1977
1983
1996
1999
1992
2001
1998
1972
1997
1981
1971
1978
1984
1985
1988
1968
1995
1976