R.L. Polk & Co. Polk's lumber directory of the United States. R.L. Polk & Co..
Chicago Style (17th ed.) CitationR.L. Polk & Co. Polk's Lumber Directory of the United States. Chicago: R.L. Polk & Co..
MLA (8th ed.) CitationR.L. Polk & Co. Polk's Lumber Directory of the United States. R.L. Polk & Co..
Warning: These citations may not always be 100% accurate.