The Bobbs-Merrill Reprint Series in Geography

25 miles wide 50 miles air routes airplane approximately areas Atlas automobile average based chiefly belt 25 miles bulky freight cable cents per ton-mile century ago changing world Commerce COMMUNICATION MAPS costs of transport day FIG day's devices devise different dates distance driver ECONOMIC-BARRIER MAPS Europe experimental and subject experimental map fastest available feasible to travel Geographers graphic hard-surfaced roads heights highways Historical Geography horse-drawn vehicle horseback human increase international boundaries isotachic map mail was carried Main Post Roads map is experimental MAP TYPES means of transport miles a day miles per day motor truck NATIONAL ECONOMIC BARRIERS Philadelphia plate pony porters Public Roads railroad Railway readily represented revision shaded shown Similar maps single city Staley surface means tariff walls telegraph time-table tion train transport per ton-mile TRANSPORT-COST Travel speeds TRAVEL-SPEED MAPS unit costs vastly visualize width World Economy world maps York