When did the first Harry Potter book come out?
1997
1977
1977
1977
1977
1939
1977
1939
1977
1971
1939
1990
1977
1971
1990
1977
1971
1939
1990
1977
1971
1939
1902
1990
1991
1977
1971
1939
1990
1991
1977
1971
1902
1890
1896
1990
1991
1977
1971
1939
1987
1902
1890
1896
1990
1991
1977
1971
1987
1905
1939
1978
1902
1890
1990
1896
1991
1976
1977
1971
1987
1970
1897
1905
1939
1978
1990
1991
1976
1977
1971
1987
1902
1890
1896
1970
1904
1978
1990
1897
1991
1976
1977
1971
1905
1939
1987
1970
1907
1902
1890
1896
1978
1931
1904
1908
1990
1991
1976
1977
1971
1987
1981
1897
1970
1905
1939
1907
1978
1902
1890
1990
1896
1923
1991
1976
1977
1971
1987
1992
1931
1904
1981
1970
1897
1905
1939
1978
1908
1990
1893
1991
1976
1977
1971
1987
1907
1992
1902
1890
1981
1896
1955
1970
1904
1978
1989
1990
1897
1923
1991
1976
1977
1971
1905
1939
1987
1992
1931
1981
1893
1955
1970
1902
1890
1896
1978
1904
1989
1908
1990
1991
1976
1971
1987
1907
1992
1981
1897
1955
1970
1905
1939
1978
1974
1902
1890
1989
1975
1990
1896
1894
1923
1991
1976
1892
1971
1987
1992
1931
1981