Preface, by L. P. Kellogg.--Turner's formative period, by F. Mood.--The early writings of Turner (p. 41-229): The significance of history. Problems in American history. The character and influence of the Indian trade in Wisconsin. The significance of the frontier in American history.--Bibliographies, compiled by E. E. Edwards p. [231]-272)--Appendix: A comparison of differing versions of the significance of the frontier.--Indexes