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Subcategories of "Energy & Environment"

BACK 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
Energy & Environment BACK
Engine Systems 0 0 0 0 0 0 0 0 0 0
Power & Energy System 0 0 0 0 0 0 0 0 0 0
Environmental Engineering 0 0 0 0 0 0 0 0 0 0
BACK 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999
Events in Japan 1 1 1 2 4 4 1 2 1 0
Events in the World 1 2 1 0 0 0 1 1 0 1
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