Geology of to-day;
a popular introduction in simple language,
by J. W. Gregory ... with 58 illustrations & diagrams.
APA Citation
Gregory, J. W. (John Walter). (1915). Geology of to-day: a popular introduction in simple language. Philadelphia: J. B. Lippincott.
MLA Citation
Gregory, J. W. (John Walter), 1864-1932. Geology of To-day: a Popular Introduction In Simple Language. Philadelphia: J. B. Lippincott, 1915.
Warning: These citations may not always be complete (especially for serials).