Penguin book
1948
1948
1948
1947
1950
1951
1950
1950-1951
1951
1950-1952
circa 1950
circa 1950
1951
1948
1951
1949
2000-100 BCE
1938 and 1951
1947
1948
1955; 1830
1949
1950
1951
1951
1950
1948
1949
circa 1950
circa 1950
1951
1948
1950
1951
1951
1951
1990-96
1949
1948
1951
1947-1948
1950
1949
1950
circa 1947
1950-1951
1947
1950
1903 (original); 1982 (model)
1950-1951
1949