The ferns of the county line serpentinite dike
Anonymous (not verified)
The herpetofauna of Nottingham Park and the Serpentine Barrens of Chester County, Pennsylvania
Anonymous (not verified)
Some Pennsylvania barrens and their flora. I. Serpentine
Anonymous (not verified)
Plant bugs (Heteroptera: Miridae) of Phlox subulata and other narrow-leaved phloxes in eastern United States
Anonymous (not verified)
Diabrotica cristata, a chrysomelid (Coleoptera) of relict midwestern prairies discovered in eastern serpentine barrens
Anonymous (not verified)
Fertile lessons from hostile land
Anonymous (not verified)
A preliminary herpetological survey in the serpentine barrens of Chester County, Pennsylvania
Anonymous (not verified)
Steatite quarries of northeastern Maryland and southeastern Pennsylvania: an analysis of quarrying technology
Anonymous (not verified)