, ▁Conserv ation , ▁The ▁O ' B rien ▁Press . ▁ 2 0 1 1 ▁ ▁Al en ▁Mac We en ey ▁( ph ot og .) ▁& ▁Richard ▁Con n iff , ▁The ▁Stone ▁W alls ▁of ▁Ireland . ▁London : ▁Th ames ▁& ▁Hudson , ▁ 1 9 8 6 ▁; ▁New ▁York : ▁Stewart , ▁T abor i ▁& ▁Ch ang , ▁ 1 9 8 6 ▁ ▁External ▁links ▁▁▁ ▁How ▁to ▁build ▁a ▁dry ▁stone ▁wall ▁ ▁D ry ▁Stone ▁Wall ing ▁Association ▁of ▁Canada ▁ ▁D ry ▁Stone ▁W alls ▁Association ▁of ▁Australia ▁ ▁The ▁D ry ▁Stone ▁Wall ▁Association ▁of ▁Ireland ▁ ▁D ry ▁Stone ▁Wall ing ▁Association ▁of ▁Great ▁Britain ▁ ▁Current ▁Arch ae ology ▁notes ▁on ▁Working ▁Hol id ays ▁repair ing ▁dry ▁stone ▁walls ▁ ▁The ▁D ry stone ▁Conserv ancy , ▁USA ▁ ▁Project ▁Al p ter , ▁Ter rac ed ▁Land sc apes ▁of ▁the ▁Al pine ▁Arc , ▁a ▁network ▁of ▁associations ▁in ▁Western ▁Europe ▁ ▁Category : St on em ason ry ▁Category : Build ing ▁stone ▁Category : Types ▁of ▁wall ▁Category : F ences ▁Category : St one ▁( material ) ▁Category : N atural ▁materials ▁Category : G arden ▁features ▁Category : Arch itect ural ▁elements ▁Category : Build ing ▁materials ▁Category : St on em asons <0x0A> </s> ▁German ▁sub marine ▁U - 6 7 2 ▁was ▁a ▁Type ▁VII C ▁U - bo at ▁of ▁Naz i ▁Germany ' s ▁Kriegs marine ▁during