ucture ▁ ▁U IS ▁voting ▁members ▁consist ▁of ▁a ▁delegate ▁from ▁each ▁member ▁country ▁representing ▁the ▁ca vers ▁and ▁spe le olog ists ▁of ▁that ▁country , ▁rather ▁than ▁any ▁of ▁the ▁official ▁national ▁bodies . ▁ ▁Its ▁activities ▁take ▁place ▁in ▁a ▁number ▁of ▁comm issions ▁and ▁working ▁groups , ▁such ▁as ▁the ▁U IS ▁In format ics ▁Commission ▁formed ▁in ▁ 1 9 8 6 , ▁the ▁Spe le other apy ▁Commission ▁and ▁the ▁Kar st ▁H ydro ge ology ▁and ▁Spe le ogen esis ▁Commission . ▁ ▁Publications ▁ ▁The ▁U IS ▁publish es ▁the ▁International ▁Journal ▁of ▁Spe le ology . ▁ ▁Further ▁reading ▁ ▁References ▁ ▁External ▁links ▁▁▁ ▁International ▁Union ▁of ▁Spe le ology ▁( UI S ). ▁ ▁Category : M embers ▁of ▁the ▁International ▁Council ▁for ▁Science ▁Category : C aving ▁organizations ▁Category : Organ izations ▁established ▁in ▁ 1 9 6 5 ▁Category : Post oj na ▁Category : 1 9 6 5 ▁establish ments ▁in ▁Sloven ia <0x0A> </s> ▁The ▁Pil gr im ' s ▁Progress : ▁The ▁Third ▁Part ▁is ▁a ▁pse ude p ig raph ic ▁sequ el ▁to ▁John ▁Bun yan ' s ▁ 1 6 7 8 ▁novel ▁The ▁Pil gr im ' s ▁Progress , ▁written ▁by ▁an ▁anonymous ▁author . ▁It ▁was ▁published ▁with ▁Bun yan ' s ▁work ▁in ▁ed itions ▁from ▁ 1 6 9 3 ▁to ▁ 1 8 5 2 ▁because ▁it ▁was ▁believed ▁to ▁be ▁written ▁by ▁Bun yan . ▁It ▁presents