Title: The factors of social evolution
Description: <a href="http://uf.catalog.fcla.edu/uf.jsp?st=UF000621626&ix=nu&I=0&V=D" rel="nofollow">http://uf.catalog.fcla.edu/uf.jsp?st=UF000621626&ix=nu&I=0&V=D</a>
Subjects: Civilization, Sociology, Civilization.