Even if you are not a science student, you may find useful information contained here. Academia Education Nat. The best part is that UC Irvine has the resources to update the site regularly. This is a site for browsing all sorts of military history references, many pertain to the Civil War. The actual archives are built on a historic site.
Admission is free.
The Elements of Style. This is especially true if you use, or want to use, Peer Instruction as part of your classes. This site allows you to become part of the experimental team searching for life on other planets. This site lists the only science quotation books on the market. The next two sites will give you comparison shopping for textbooks on-line.