, ▁M . ▁( 2 0 0 6 – 1 1 ). ▁Castle c rag , ▁Sydney . ▁Retrieved ▁ 3 ▁May ▁ 2 0 1 1 ▁from ▁http :// www . gr iff in soci ety . org / L ives _ and _ works / a _ castle c rag . html ▁Sp ath op oul os , ▁W . ▁( 2 0 0 7 ). ▁The ▁C rag : ▁Castle c rag ▁ 1 9 2 4 - 1 9 3 8 . ▁Black he ath : ▁Brand l ▁& ▁Schles inger . ▁Walker , ▁M ., ▁Kab os , ▁A ., ▁& ▁We ir ick , ▁J . ▁( 1 9 9 4 ). ▁Building ▁for ▁nature : ▁Walter ▁Bur ley ▁Griff in ▁and ▁Castle c rag . ▁Castle c rag : ▁Walter ▁Bur ley ▁Griff in ▁Society ▁In cor por ated . ▁Will ough by ▁City ▁Council . ▁( 2 0 1 1 ). ▁Conserv ation ▁areas : ▁Griff in ▁– ▁Castle c rag . ▁Retrieved ▁ 4 ▁May ▁ 2 0 1 1 ▁from ▁https :// web . archive . org / web / 2 0 1 1 0 3 3 1 1 9 2 9 2 9 / http :// www . will ough by . ns w . gov . au / your - ne igh bour hood / her itage / Place / Her itage - Con serv ation - A reas / 6 / ▁ ▁External ▁links ▁▁▁ ▁Castle c rag , ▁Will