Thomas Radford Agg

1878

• American rural highways
• The construction of roads and pavements
• The preparation of engineering reports
• The use of Iowa gravel for concrete
• Highway administration and finance
• Highway transportation costs
• Operating cost statistics of automobiles and trucks
• Resistances to the translation of motor vehicles
• Tractive resistance and related characteristics of roadway surfaces
• Tractive resistance of automobiles and coefficients of friction of pneumatic tires
• Traffic on Iowa highways