You may wish to use this advanced search formula to find sources in Google:

1. Go to: 

2. In the search box paste this formula and add your general or narrowed topic in the last parentheses)

(oregon OR idaho OR "washington state" OR "pacific northwest”) AND (history) AND (your general topic or narrowed topic)

Example:

(oregon OR idaho OR "washington state" OR "pacific northwest”) AND (history) AND ("fur trade" OR “fur industry” OR trappers)

• Find websites that are more relevant to your needs
• Limit your results by domain name (.edu or .org or .gov, for example)

EXAMPLE:

Northwest

Washington

Oregon

Idaho

Montana

Alaska