Poland, the unexplored /
by Grace Humphrey.

APA Citation

Humphrey, G. (1931). Poland, the unexplored. [1st ed.]. Indianapolis: Bobbs-Merrill.

MLA Citation

Humphrey, Grace, 1882-. Poland, the Unexplored. [1st ed.]. Indianapolis: Bobbs-Merrill, 1931.

Warning: These citations may not always be complete (especially for serials).