Glancy Prongay & Murray LLP, a Leading Securities Fraud Law Firm, Announces Investigation of Koppers Holdings Inc. (KOP) on Behalf of Investors | Business Wire
Koppers Holdings Inc. Company Profile - The Business Journals
Koppers Holdings Inc. - AnnualReports.com
Koppers Holdings Inc. (NYSE:KOP) Seasonal Chart | Equity Clock
How Good Is Koppers Holdings Inc. (NYSE:KOP), When It Comes To ROE?