I use Bill's as for rough values. And I use the clubs on line site if I want to see a strike both sides.

And here is a plug for that site. Jim is in need if some scans especially on some of the non Nevada strikes. I send them when I get a strike so he can put the scans up for all to enjoy and use.

If you have never been there. Check it out. Click the link.
http://www.silverstrikers.com/WebPages/MainPages/Strike-Online-Catalog-Page.html