Letter to F. Bishop, 7 February 1989
Anonymous (not verified)
Checklist of the moths of the Goat Hill, Rock Springs and New Texas serpentine barrens
Anonymous (not verified)
Geology of Nottingham County Park
Anonymous (not verified)
Plant Life on Serpentines and Related Rocks in the North of Sweden
Anonymous (not verified)
The serpentine barrens of Chester County
Anonymous (not verified)
Floras of the Serpentinite Formations in Eastern North America, with Descriptions of Geomorphology and Mineralogy of the Formations
Anonymous (not verified)
Spatial and temporal patterns of occurrence for selected invertebrate lineages and their association with vascular plants in barrens and related habitat types in Pennsylvania
Anonymous (not verified)
Chromite and other mineral deposits in serpentine rocks of the Piedmont Upland, Maryland, Pennsylvania, and Delaware
Anonymous (not verified)
The history of chromite mining in Pennsylvania and Maryland
Anonymous (not verified)