1. Trace element accumulation in a feather moss and in soil near a kraft paper mill in Ontario;Barclay-Estrup;Bryologist,1979
2. Toxic Metals and Their Analysis;Berman,1980
3. Breil, D.A., 1994. Mosses of Southern Virginia Piedmont. Unpublished checklist, Dept. Nat. Sciences, Longwood College, Farmville, VA 23909.
4. Mosses of Eastern North America;Crum,1981
5. Department of Environmental Quality (DEQ), 2000. Virginia toxics release inventory (TRI) Summary Report, 1998 SARA Title III Section 313 TRI Inventory Reports (Form Rs).