astronomia TecaLibri R. Williamson: opere 1981 Archaeoastronomy in the Americas, Ballena, Los Altos, CA, [rif.] a cura di: id. 1992 Earth and Sky: Visions of the Cosmos in Native American Folklore, University of New Mexico Press, Albuquerque, [rif.] a cura di: id., C. Farrer