Part,  Chapter, Paragraph

1    I,     2.  1    | air, connecting in hours extremes of the world with their
2    I,     2.  2    | air, connecting in hours extremes of the world.~ ~The report
3   II,     9        | pertinent to compare the extremes of the age distribution.
4   II,     9.  1.  2| pertinent to compare the extremes of the age distribution.
5  III,    10.  6.  3| only when it reaches the extremes of unavoidable physical