By the Great Horn Spoon (by Sid Fleischman) and California Gold Rush Links!
The Number 1 Link is a web adventure with an animated map, and many interesting and delightful details. If you can create a better one, let's do it!
http://library.thinkquest.org/50048/
Here is a PBS-sponsored website on the California Gold Rush. It's the perfect companion for background details related to Jack and Praiseworthy's adventures.
Bowler Hats: http://www.millerhats.com/homburg3.html