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![tight-cave-entrance-in-appalachia.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721157057907-83Q8BP3P39Z1G1PDXF33/tight-cave-entrance-in-appalachia.jpg)
![cave-entrance-in-maryland.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721156547889-QOIQ9J2CGPH4UALH14XR/cave-entrance-in-maryland.jpg)
![cave-entrance-in-pa.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721156549036-DNVY8V50OK73D9YQ0JMI/cave-entrance-in-pa.jpg)
![caver-emerging-from-tight-entrance.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721157229733-BH2S7R072MT5641BUB7A/caver-emerging-from-tight-entrance.jpg)
![tonoloway-limestone-in-maryland.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721157056146-NE85AZS6RBTSQGYFRU9B/tonoloway-limestone-in-maryland.jpg)
![pretty-cave-passage-in-pa.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721760188285-17K5W144PY98NU5QEYRI/pretty-cave-passage-in-pa.jpg)
![caver-crawling-out-of-tight-cave.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721158341571-O4LD2BIMAH65AWK5W1OO/caver-crawling-out-of-tight-cave.jpg)
![blue-spring-maryland.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721760188506-LPB2D76WMFME1LNBKFEW/blue-spring-maryland.jpg)
![ice-inside-of-pa-cave (1).jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721666271846-5ZOOAVAPOTFLDEZA9ART/ice-inside-of-pa-cave+%281%29.jpg)
![water-filled-sinkhole.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721157056082-SKV8VE1NSI1G9XW0A4GT/water-filled-sinkhole.jpg)
![large-cave-entrance-in-appalachia.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721157058912-C0EFD72HMYHDX4ZBRQWX/large-cave-entrance-in-appalachia.jpg)
![digging-open-cave-entrance (1).jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721666272957-3T9UU5FVL85JS6OITSQI/digging-open-cave-entrance+%281%29.jpg)
![caver-inside-cave-in-pa.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721156546507-1R8H34FQXCRC47WNQ7TY/caver-inside-cave-in-pa.jpg)
![trucks-parked-on-side-of-appalachian-mountain.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721157231113-0KX7BH11T2RJ7KDDVFL4/trucks-parked-on-side-of-appalachian-mountain.jpg)
![cave-sinkhole-in-appalachia.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721156547932-ETQOEDW5RKK7S1795U5O/cave-sinkhole-in-appalachia.jpg)
![small-cave-passage-in-maryland.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721760189508-T1PYKYFYWV48J08SBQDV/small-cave-passage-in-maryland.jpg)
![cavers-digging-open-cave-entrance.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721761300569-92GRBK5LH8UGETFV9HFM/cavers-digging-open-cave-entrance.jpg)
![sinking-cave-stream-in-appalachia.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721156546489-X076NDMTNOB8VK85C2TI/sinking-cave-stream-in-appalachia.jpg)
![appalachian-backwoods-farm.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721157054761-OPB1ALXT2Q44O879M870/appalachian-backwoods-farm.jpg)
![limestone-roadcut-in-maryland.jpg](https://images.squarespace-cdn.com/content/v1/5c56f988a568272acbdf5b9d/1721157059333-8JXBJQSFR89W5ELT1FPY/limestone-roadcut-in-maryland.jpg)