Progress of archaeological survey of Iowa. - Iowa City, Iowa.

von Keyes, Charles R.
Veröffentlicht in Iowa journal of history and politics; July. 1925, S. 3-16: 6 Ill.
1925.

Some materials for the study of Iowa archaeology. - Iowa City, Iowa.

von Keyes, Charles R.
Veröffentlicht in Iowa journal of history and politics; July. 1926, S. 3-16.
1926.