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Click the mouse on any of the following topics to see information about them. If the button is checked, you have visited this page. You may see the pages again if you like. Main Menu             Prelude #1 #2 #3 #4       Dualism #1 #2 #3 #4 #5     Radical Theory #1 #2 #3 #4 #5 #6   Valance Theory #1 #2 #3 #4 #5 #6 #7   Scientific Revolutions Dualistic Theory Radical Theory Valance Theory Database Lavoisier Dalton Berzelius Dumas   Wohler Liebig Kekule Gerhardt Miscelaneous Bonding Navigation Time Line     Photographs Citations     Questions #1 #2 #3 #4 #5       #6 #7 #8 #9 #10