FlickrCC has plenty of Creative Commons licensed photos for you to find.

http://flickrcc.bluemountains.net/

you can also search Flickr with Flickrstorm. Be sure to set creative  
commons license under advanced options.

http://www.zoo-m.com/flickr-storm/

On Dec 19, 2007, at 10:57 AM, Steve Cavrak wrote:

> Yesterday, a friend showed me some work he was doing with the  
> Library of Congress "Using Primary Sources" materials an American  
> Image project
>
> 	http://memory.loc.gov/ammem/index.html
>
> There is a section on
>
> 	- American Expansionism
> 	- Teacher's Resources
>
>
>
>
> ****
>
> While searching for LOC site, I "stumbled upon"
>
>
> http://en.wikipedia.org/wiki/Wikipedia:Public_domain_image_resources
>
> On Dec 19, 2007, at 10:37 AM, Barbara Lacy {Lothrop} wrote:
>
>> One of our teachers is beginning a PhotoStory project with her  
>> students on the Westward Expansion.  Does anyone have a good source  
>> of non-copyrighted, free images the students could use
>
>
>
>
> > http://memory.loc.gov/learn/features/lewisandclark/resources_4.html