books.google.com - Written in a clear and graceful style, this classic work describes the principles of genealogical research, the evaluation of evidence, and the relationship of genealogy to chronology, eugenics, and the law; it discusses early nomenclature, royal ancestry, the use of source material, and the methods...https://books.google.com/books/about/Genealogy_as_Pastime_and_Profession.html?id=woTUU8txumkC&q=clues&utm_source=gb-gplus-shareGenealogy as Pastime and Profession
