Rand McNally standard map of air trails in Indiana, May 1936
Aeronautical information is overprinted on Rand McNally standard map of Indiana.; Includes index to cities and towns in left margin of recto and textual aeronautical information and indexed Indiana airport and airway directory, April 1936 on verso. Scale 1:735,000. 1 inch = 11.6 statute mile. 1 centimeter = 7.3 kilometers.