NatureServe:
Bark of American Sycamore Tree
NatureServe:
American bladdernut
NatureServe:
Yellow-bellied sapsucker drillmarks
NatureServe:
American hornbeam / Ironwood
NatureServe:
Tuliptree / Tulip poplar
NatureServe:
River birch bark
NatureServe:
Tuliptree with drill marks
NatureServe:
Rock Creek rapids