▁was ▁changed ▁to ▁Ma qu ok eta ▁C aves ▁in ▁ 1 9 2 8 . ▁ ▁Add itional ▁land ▁was ▁acquired ▁in ▁ 1 9 3 1 . ▁ ▁The ▁majority ▁of ▁the ▁park ▁facilities ▁were ▁constructed ▁from ▁ 1 9 3 2 ▁to ▁ 1 9 3 9 ▁by ▁the ▁Civil ian ▁Conserv ation ▁Corps ▁( CC C ) ▁and ▁the ▁Works ▁Progress ▁Administration ▁( W PA ). ▁Both ▁programs ▁resulted ▁from ▁the ▁federal ▁government ▁effort ▁to ▁make ▁work ▁for ▁Americans ▁during ▁the ▁Great ▁De pression . ▁Their ▁work ▁makes ▁up ▁the ▁contrib uting ▁properties ▁of ▁the ▁historic ▁district . ▁ ▁They ▁include ▁three ▁C CC ▁over look ▁sh el ters , ▁the ▁entrance ▁port als , ▁the ▁cust od ian ' s ▁residence , ▁the ▁shelter house / con cess ion ▁building , ▁the ▁stone ▁pic nic ▁circle , ▁and ▁two ▁stone ▁lat r ines . ▁ ▁The ▁non contrib uting ▁structures ▁in ▁the ▁park ▁include ▁the ▁C CC / W PA ▁cave ▁improvements , ▁the ▁C CC / W PA ▁trail ▁system , ▁the ▁park ▁r anger ' s ▁residence , ▁a ▁pic nic ▁shelter , ▁and ▁two ▁wood - frame ▁lat r ines . ▁ ▁State ▁Land s cape ▁Arch itect ▁John ▁Fitz sim m ons ▁designed ▁the ▁cust od ian ' s ▁residence . ▁ ▁It ▁and ▁the ▁other ▁historic ▁structures ▁designed ▁by ▁the ▁Central ▁Design ▁Office ▁in ▁Am es , ▁Iowa ▁were ▁built ▁in ▁the ▁R ust ic ▁style , ▁which ▁was ▁prom ul g ated