Helpful Websites

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I was cleaning up some bookmarks on my computer and thought I'd pass on a few interesting sites that I've found helpful over the years.  Feel free to add to this list, if you like

pdfdrive.com - a search engine for pdf files - 79 million ebooks for download
core.ac.uk - the world's largest collection of open access research papers
citationsy.com - create citations, reference lists and bibliographies
archive.org - the internet archive and home of the Wayback Machine
elephind.com - a search engine for the world's historical newspaper archives

sometimes useful, always fun