The Erwin History Site is dedicated to the families of Erwin, Howard, Street, and Crow, that arrived in Oklahoma at the beginning of the 20th century.
Here are some of my favorite websites:
Phil Erwin's Family Story (https://sites.google.com/site/philerwinsheritage/home)
Plains Tree Holly Blog (http://plainshollytree.blogspot.com/)
World Connect site (http://wc.rootsweb.com/cgi-bin/igm.cgi?db=erwin_oklahoma)