924.
THE ORDER OF THE BOOK.
Place at the beginning what a river can effect.
925.
A book of driving back armies by the force of a flood made by releasing waters.
A book showing how the waters safely bring down timber cut in the mountains.
A book of boats driven against the impetus of rivers.
A book of raising large bridges higher. Simply by the swelling of the waters.
A book of guarding against the impetus of rivers so that towns may not be damaged by them.
926.