Shelford, Victor E. (Victor Ernest), 1877-19681 map : color; 41 x 53 cmScale [approximately 1:380,000]. ; 'From publications of State and Government surveys by Leverett, Alden, Blatchley, Lane, Atwood, Goldthwait, and others.'9962936194202441ark:/81985/n2765cf78Geographic Society of ChicagoPublicEcological base map of the Chicago areaMapsIllinois--Chicago Region1930?Northwestern University