John Muir: 1838 to 1914
Biographies Online: John Muir
Britannica: John Muir
Middle School Search: A Mountain Calling: John Muir with full text article- click on the link to the pdf article
To search for biographies, see
Biographies Online (database specifically designed for biographies)
Sweetsearch Biographies (searching websites for biographies)
Don't forget to cite your sources.
Easybib.com is a good choice.
Even site your pictures.
If you search Google for pictures, type "copyright free images of X" For example, if you are looking for images of John Muir, type "copyright free images of John Muir"