Alan Cressler:
sabatia angularis crystal cave ridge mammoth cave national park edmonson co ky 2
Alan Cressler:
mammoth cave historic entrance mammoth cave national park edmonson co ky 2
Alan Cressler:
Macrocera nobilis, with trapped Neaphaenops tellkampfi tellkampfi, Kangaroo Trail, inside the Daleo Entrance, Roppel Cave, Hart County, Kentucky 2
Alan Cressler:
gory hole hoosier national forest lawrence co in elliot stahl 3
Alan Cressler:
gary pit harrison crawford state forest harrison co in marianne batchelder tymme laun jeff moore 1
Alan Cressler:
gary pit, harrison crawford state forest, harrison county, indiana, formation at the bottom of the second pit, jeff moore 1
Alan Cressler:
gary pit harrison crawford state forest harrison co in second pit manuel beers 1
Alan Cressler:
gary pit harrison crawford state forest harrison co in strange wall formation at the bottom of the second pit 2
Alan Cressler:
gary pit harrison crawford state forest harrison co in top of the second pit manuel beers 2
Alan Cressler:
gary pit harrison crawford state forest harrison co in formation at the bottom of the entrance pit manuel beers 2
Alan Cressler:
blue river near duke hill crawford and harrison cos in 2
Alan Cressler:
Binkleys Cave, Entrance One, Harrison County, Indiana, Left to Right, Sean Lewis, Alan Cressler, Irina Melnic, Jeff Moore, Steve Gladieux, Elliot Stahl, Manuel Beers, Jason Lindberg 1
Alan Cressler:
binkleys cave entrance one harrison co in helectite utopia 3
Alan Cressler:
binkleys cave entrance one harrison co in helectite utopia steve gladieux 1
Alan Cressler:
binkleys cave entrance one harrison co in helectite utopia 4
Alan Cressler:
binkleys cave entrance one harrison co in helectite utopia 5
Alan Cressler:
wallier cave harrison co in jeff moore steve gladieux hector mejia 2
Alan Cressler:
wallier cave harrison co in hector mejia 2
Alan Cressler:
big mouth cave harrison co in jeff moore steve gladieux 1
Alan Cressler:
unnamed stream yellow birch ravines nature preserve crawford co in 3
Alan Cressler:
waterfall yellow birch ravines nature preserve crawford co in 1
Alan Cressler:
waterfall yellow birch ravines nature preserve crawford co in 4
Alan Cressler:
Asplenium pinnatifidum, Yellow Birch Ravines Nature Preserve, Crawford County, Indiana 1
Alan Cressler:
unnamed stream yellow birch ravines nature preserve crawford co in 4
Alan Cressler:
Huperzia porophila, Yellow Birch Ravines Nature Preserve, Crawford County, Indiana 1
Alan Cressler:
Huperzia porophila, Yellow Birch Ravines Nature Preserve, Crawford County, Indiana 4
Alan Cressler:
Huperzia porophila, Yellow Birch Ravines Nature Preserve, Crawford County, Indiana 7
Alan Cressler:
Large Shelter, Box Canyon, Yellow Birch Ravines, Nature Preserve, Crawford County, Indiana, Alan Cressler 1
Alan Cressler:
unnamed stream yellow birch ravines nature preserve crawford co in 7
Alan Cressler:
Parathelypteris noveboracensis, and Dryopteris intermedia, Yellow Birch Ravines Nature Preserve, Crawford County, Indiana 2
