Links for Civil War Letter Assignment,
http://guides.library.duke.edu/c.php?g=289364&p=1929646
http://civilwararchive.com/LETTERS/letters.htm (use EXTERNAL LINKS)
https://cplorg.contentdm.oclc.org/digital/collection/p4014coll9/id/609/rec/1
https://content.lib.auburn.edu/digital/collection/civil/search
https://content.lib.washington.edu/civilwarweb/index.html