The 17-volume Macropædia is the third part of the ORGANIZATION@1 ; the other two parts are the 12-volume Micropædia and the 1-volume Propædia .

The 17-book Macropædia is the third part of the Encyclopædia Britannica , and the other two parts are the 12-book Micropædia and the 1-book Propædia .
