Shirk, Willis L., Jr. "Holtwood Hydroelectric Power Plant." Pennsylvania
Heritage Magazine Summer 2009: n. pag. Print.
Shirk, Willis L., Jr. "Holtwood Hydroelectric Power Plant." Pennsylvania
Heritage Magazine Summer 2009: n. pag. Print.
Shirk, Willis L., Jr. "Holtwood Hydroelectric Power Plant." Pennsylvania
Heritage Magazine Summer 2009: n. pag. Print.
Shirk, Willis L., Jr. "Holtwood Hydroelectric Power Plant." Pennsylvania
Heritage Magazine Summer 2009: n. pag. Print.
"Hoover Dam Power FAQs." Bureau
of Reclamation: Lower Colorado Region -
Hoover Dam Power FAQs.
Bureau of Reclamation, Lower Colorado Region, n.d. Web. 11 Mar.
2014.
"Hydropower- Energy Explained, Your Guide To Understanding Energy -
Energy Information Administration." Hydropower - Energy Explained, Your Guide
To Understanding Energy - Energy Information Administration. Energy
Information Administration, n.d. Web. 10 Mar. 2014.
"Hydroelectricity."
EPA.
Environmental Protection Agency, 25 Sept. 2013. Web. 10 Mar. 2014
"Hydroelectric Power: How It Works." Hydroelectric
Power: How It Works, USGS Water-Science School.
United States Geological Survey, n.d. Web. 11 Mar. 2014.
Shirk, Willis L., Jr. "Holtwood Hydroelectric Power Plant." Pennsylvania
Heritage Magazine Summer 2009: n. pag. Print.
Shirk, Willis L., Jr. "Holtwood Hydroelectric Power Plant." Pennsylvania
Heritage Magazine Summer 2009: n. pag. Print.
Shirk, Willis L., Jr. "Holtwood Hydroelectric Power Plant." Pennsylvania
Heritage Magazine Summer 2009: n. pag. Print.
Shirk, Willis L., Jr. "Holtwood Hydroelectric Power Plant." Pennsylvania
Heritage Magazine Summer 2009: n. pag. Print.
"Hoover Dam Power FAQs." Bureau
of Reclamation: Lower Colorado Region -
Hoover Dam Power FAQs.
Bureau of Reclamation, Lower Colorado Region, n.d. Web. 11 Mar.
2014.
"Hydropower- Energy Explained, Your Guide To Understanding Energy -
Energy Information Administration." Hydropower - Energy Explained, Your Guide
To Understanding Energy - Energy Information Administration. Energy
Information Administration, n.d. Web. 10 Mar. 2014.
"Hydroelectricity."
EPA.
Environmental Protection Agency, 25 Sept. 2013. Web. 10 Mar. 2014
"Hydroelectric Power: How It Works." Hydroelectric
Power: How It Works, USGS Water-Science School.
United States Geological Survey, n.d. Web. 11 Mar. 2014.