But here we come upon a problem of another kind.
"The Expositor's Bible: The Book of Exodus"
G. A. Chadwick
She was apparently turning over some problem in her mind.
"Marjorie Dean High School Freshman"
Pauline Lester
With this information you proceed to work out your problem and secure your longitude according to the following formula.
"Lectures in Navigation"
Ernest Gallaudet Draper