The author stated in the Preface that this 700-page biography is based upon original manuscripts. He wrote, “In addition to their regular correspondence with the Mission Board, Zeisberger and his fellow missionaries wrote voluminous journals of their everyday life among the Indians, as also complete reports of any occurrences of special interest. These manuscripts, which are mostly in the German language and number many thousands of pages, have been preserved, and I have carefully studied them all.” A comprehensive geographical glossary and an exceptionally detailed index are found at the end of the book.