333.309 M Monchow, Helen Corbin Seventy years of ral estate subvividins in the region of chicado, by Helen Corbin Monchow. Evanston and Chicago, Mortwestern university, 1939. 200 p. incl. illus. (mapas) tablas, diagrs 23 cm (Nosthwestern university studies in the social sciences. no. 3)