Such regulations shall provide for the preservation , from injury or spoliation , of all timber , mineral deposits , natural curiosities , or wonders within said park , and their retention in their natural condition . The Secretary may in his discretion , grant leases for building purposes for terms not exceeding ten years , of small parcels of ground , at such places in said park as shall require the erection of buildings for the accommodation of visitors all of the proceeds of said leases , and all other...
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