1
But these were not the principal difficulties which the allies encountered.
2
Herein lies one of the principal difficulties.
3
Richard Challoner, bishop of Debra, with his annotations for clearing up the principal difficulties of Holy Writ.
4
One of the principal difficulties of the method at present is the time ordinarily required to obtain a good picture.
5
The principal difficulties of the problem of the union between the mind and the body proceed from the two following facts, which seem incompatible.
6
The principal difficulties we encountered in descending the river were from the drifted timber, which obstructions all know are not difficult to be removed.
7
The principal difficulties we encountered in descending the river, were from the drifted timber, which obstructions all know is not difficult to be removed.