THE CHILDHOOD OF MAN; A POPULAR ACCOUNT OF THE LIVES, CUSTOMS AND THOUGHTS OF THE PRIMITIVE RACES LEO FROBENIUS 1909
THE FLAMING DOOR; A PRELIMINARY STUDY OF THE MISSION OF THE CELTIC FOLK-SOUL BY MEANS OF LEGENDS AND MYTHS ELEANOR C. MERRY 1936
THE GOAL OF THE HUMAN RACE, OR, THE DEVELOPMENT OF CIVILISATION, ITS ORIGIN AND ISSUE RUDOLF FRIEDRICH GRAU 1892