Air-sampling flask used for observations of atmospheric carbon dioxide, 1980s
1980s
1980s
1982-1983
1992-1994
1993
1992
1991
1988
1991
1991
1970-1990
1930-1940
1970-1980
1976
1990-1996
1990-1996
1984-1996
1970-1980
1983
1970-1980
1974-1990
1970-1980
1987-1989
1986
1996
1974-1990
1974-1991
1990
1988
1974-1990
1970-1980
1970-1980
1960-1969
1969
1940-1970
1960s-1970s
1960-1980