Shows the relation of physical features to living things and to some of the chief institutions of civilization.
51.

Master Mariners.
By JOHN R.SPEARS, author of _The History of Our Navy_, etc.

A history of sea craft adventure from the earliest times.
SOCIAL SCIENCE 91.

The Negro.
By W.E.BURGHARDT DUBOIS, author of _Souls of Black Folks_, etc.

A history of the black man in Africa, America or wherever else his presence has been or is important.
77.