Link: http://www.paenvironmentdigest.com/newsletter/default.asp?NewsletterArticleID=59618&SubjectID=
Workgroup: Abandoned Mine Drainage
Link: http://www.paenvironmentdigest.com/newsletter/default.asp?NewsletterArticleID=59618&SubjectID=
Workgroup: Abandoned Mine Drainage
Cover photo credit: Ed Bacon