Original: The one-volume PropÃ dia is the first of three parts of the 15th edition of EncyclopÃ dia Britannica, the other two being the 12-volume MicropÃ dia and the 17-volume MacropÃ dia.
Simplified: The PropÃ dia is the first of three parts of the Encyclopaedia Britannica,, the other two being the 12-volume MicropÃ dia and the 17-volume MacropÃ dia.