To AVOID annoying the reader with footnotes or index figures in the text, I have segregated my notes and have located them by reference to page and key words. I also refer to items in the bibliography of chief sources by using the symbols there assigned to them. In referring to books not listed in the bibliography I have followed the practice of giving the date and place of publication only when the work is rare or the edition of some special importance. At the beginning of the section on each chapter, I list the general authorities. I give additional references (1) for direct quotations not located explicitly in the text, (2) upon doubtful and controversial points, (3) for material not contained in the general authorities.
A PRECOCIOUS FRONTIER
General authorities: Hi; Ba; HiT; Ne; Era; Turner F. J.: The Frontier in American History; Paxson F. L.: The Last American Frontier; Caughey J. W.: The History of the Pacific Coast.