"The influence of (the national parks) is far beyond what is usually esteemed or usually considered. It has a relation to efficiency -- the working efficiency of the people, to their health, and particularly to their patriotism -- which would make the parks worth while, if there were not a cent of revenue in it, and if every visitor to the parks meant that the Government would have to pay a tax of $1 simply to get him there."

-- J. Horace McFarland

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