I am currently a history student who is doing research, which naturally involves gathering primary sources. What are some of the best places online to find primary sources, in terms of getting access to scans of the documents or just knowing what sources are out there? My current methods for finding more sources mainly are citations (Wikipedia and secondary sources) and searching on databases that my school has access to (such as the Bibliography of British and Irish History, although I've sometimes had trouble discovering what's out there by doing this). My particular period of research is 17th Century Britain and the English Civil War period, but I would be incredibly interested to know the process that others use to find new sources in general.
I don't have anywhere specific to point you to, but our Monday Methods series on finding and understanding sources should be helpful. I'd also point out that the librarians at your institution are trained to help with this exact problem. They're an excellent resource you shouldn't be shy about taking advantage of!