I always try to use Abebooks and I checked and they have a copy of the book on the 26th Louisiana Infantry. Price was $55 plus shipping. Here is their address...

http://www.abebooks.com/

Booth's Records can usually be found at most libraries in Louisiana. You can also access them over the internet at this address...

http://www.rootsweb.com/~usgenweb/la/military/WBTS.htm

You can search the Louisiana Confederate Pension Database at this address...

http://www.sec.state.la.us/archives/gen/cpa-alpha.htm