VESTIGES OF THE MAYAS, OR, FACTS TENDING TO PROVE THAT COMMUNICATIONS AND INTIMATE RELATIONS MUST HAVE EXISTED, IN VERY REMOTE TIMES, BETWEEN THE INHABITANTS OF MAYAB AND THOSE OF ASIA AND AFRICA AUGUSTUS LE PLONGEON 1881
PROPHECY EXPLAINED, PAST, PRESENT AND FUTURE; A SERIES OF FIFTY–TWO STUDIES FOR THE INDIVIDUAL, THE CLASS AND THE HOME GEORGE H. PATCH 1921
IS AMERICA WORTH SAVING?: ADDRESSES ON NATIONAL PROBLEMS AND PARTY POLICIES NICHOLAS MURRAY BUTLER 1920
THE NATURAL HISTORY OF THE HUMAN SPECIES: ITS TYPICAL FORMS, PRIMEVAL DISTRIBUTION, FILIATIONS, AND MIGRATIONS CHARLES HAMILTON SMITH 1851