Porto Alegre: Edicoes da Faculdade de Filosofia, 1959. Paperback. 131p., index & errata leaf, sewn signatures with numerous tipped-in plates, folded maps and tables; paperbound in plain printed 8.5x5 inch buff wraps. A worn copy with a bit of handling soil, a cover smudge and a touch of silverfishing. Author Rothwell was then at the University of Miami.