PCAD - Link: Retreating glaciers create Puget Sound and Grand Coulee as the Ice Age ends about 15,000 years ago.

Accessed at URL:

Accessed at URL:

http://www.historylink.org/index.cfm?DisplayPage=output.cfm&file_id=5087

Originally accessed:

Originally accessed:

2014-09-29

Organization:

Organization:

HistoryLink.org

Building:

Building:

State of Washington, Highway Department, Lake Washington Floating Bridge #1, Seattle-Bellevue, WA