Original: The 17-volume MacropÃ dia is the third part of the EncyclopÃ dia Britannica; the other two parts are the 12-volume MicropÃ dia and the 1-volume PropÃ dia.
Simplified: The 17-book MacropÃ dia is the third part of the EncyclopÃ dia Britannica, and the other two parts are the 12-book MicropÃ dia and the 1-book PropÃ dia.