what was the ice age and how did it change New York
http://www.newyorknature.net/IceAge.html
http://www.westernny.com/geology.html
http://www.farlang.com/gemstones/gratacap-geology-new-york/page_225
http://www.westernny.com/geology.html
http://www.farlang.com/gemstones/gratacap-geology-new-york/page_225