Scientific correspondence arranged in a chronological sequence

The correspondence is arranged as follows:

G.1, 1930, 1935

G.2, 1938

G.3, 1939

G.4, 1948, 1949

G.5, 1950-1952

G.6, 1955, 1956

G.7, 1960-65

G.8, 1966-69

G.9, 1970-75

G.10, 1976-79

G.11, 1980

G.12, 1981

G.13, 1982

G.14, 1983

G.15, 1984

G.16, 1985

G.17, 1986-87