▁and ▁development ▁pressure . ▁The ▁cabin ▁communities ▁are ▁part ▁of ▁an ▁important ▁landscape ▁demonstr ating ▁key ▁phases ▁in ▁the ▁history ▁of ▁Royal ▁National ▁Park ▁including ▁Ab original ▁occupation , ▁past oral ism , ▁agricult ure ▁and ▁recre ation ▁uses . ▁The ▁latter ▁began ▁in ▁the ▁ 1 9 2 0 s , ▁continued ▁during ▁the ▁De pression ▁period ▁and ▁intens ified ▁during ▁and ▁immediately ▁after ▁the ▁Second ▁World ▁War , ▁reflect ing ▁important ▁social ▁and ▁work place ▁re forms ▁in ▁NS W ▁at ▁that ▁time ▁that ▁provided ▁more ▁le is ure ▁time ▁( State ▁Sign ific ance ). ▁ ▁The ▁historical ▁associations ▁of ▁the ▁coast al ▁cabin ▁communities ▁en comp ass ▁both ▁the ▁Sydney ▁and ▁Il la war ra ▁regions , ▁with ▁some ▁of ▁these ▁associations ▁extending ▁back ▁to ▁the ▁ 1 9 2 0 s . ▁The ▁cab ins ▁themselves ▁are ▁significant ▁for ▁their ▁continu ity ▁of ▁use ▁and ▁associations , ▁most ▁of ▁them ▁for ▁over ▁si xty ▁years . ▁Historical ▁associations ▁are ▁found ▁with ▁the ▁northern ▁Il la war ra ▁min ing ▁community ▁of ▁Hel ens burgh ▁in ▁particular , ▁and ▁this ▁association ▁is ▁reflected ▁most ▁strongly ▁in ▁the ▁Burg h ▁Hill ▁area ▁of ▁Era . ▁There ▁are ▁strong ▁historical ▁associations ▁between ▁the ▁Sur f ▁Life ▁S aving ▁clubs ▁formed ▁in ▁each ▁cabin ▁area , ▁with ▁other ▁clubs ▁in ▁the ▁Sydney ▁metropol itan ▁area ▁and ▁with ▁other ▁emer gency ▁rescue ▁services . ▁The ▁cabin ▁communities ▁are ▁significant ▁for ▁their ▁long ▁historic ▁associations ▁with ▁important ▁design ers , ▁artists , ▁mus icians