By 1929, when Conoco (Continental Oil Company) produced this lavish map featuring Colorado’s spectacular mountains, nearly every oil company was supplying road maps as part of its campaign to boost tourism. This appealing drive-through station is a far cry from the first retail outlets for gas — blacksmith shops and hardware stores, the same places individuals bought kerosene for their lamps. Because motorists did not trust what they could not see, companies in the 1910s introduced glass-cylinder, gravity-flow gas pumps. Courtesy, Colorado Historical Society.