Bibliography


http://www.rockefeller.edu/archive.ctr/jdrsrbio.html


http://www.pbs.org/wgbh/amex/1900/peopleevents/pande10.html


http://www.history.rochester.edu/fuels/tarbell/UPTO52.HTM

http://www.micheloud.com/FXM/SO/

http://www.clpgh.org/exhibit/carnegie.html