To search for phrases, put them in quotes such as "1860 census" or "Marian Pearson".
Use the minus symbol (-) before a term to exclude that word. Also you can use the wild card (*) to widen your searches.
For more Google search tips click here.
Lots of maps! geology.com
A non-dogmatic encyclopedia: Infogalactic.
Visit Learn Out Loud and get free history audio and video.
Words have history too: Online Etymology Dictionary.
OK, I'm a sucker for dictionaries: Merriam-Webster
Will Rogers quotes (just because): Goodreads