These have many useful links, including writing and citation guides, further links and discussion groups. He makes the point that while the Internet is good for bibliographic searches, serious research still needs to be done in libraries. That is correct, but the Internet is getting better all the time. Another source for classical and medieval literature is here. A source for early American history , including older works that would have been known by early Americans, is here.
Archaeologists look at the past differently than historians.
Instead of dealing with written records, they deal with tangible objects that tell us something about what happened in the past. There are a number of archaeological links on the net. I recommend these two to begin with. Both can be searched by region, interest area and resources. Archnet is probably the best, but Archaeology on the Net is also good.