Betty Wiltshire's three volume set, you can do so at,
Pioneer Publishing Co.
P.O. Box 408
Carrollton, MS 38917
Their web page is http://www.pioneersoutheast.com/
They show their Contact Info as,
Contact Information:
Pioneer Publishing Co.
P. O. Box 408
Carrollton, Ms. 38917
Phone: (662)237-6010
email: pioneerse@tecinfo.com
Betty's Mississippi Pension Books may be found at http://history-sites.com/cgi-bin/bbs53x/nvcwmb/webbbs_config.pl?form=65677
Product ID # 146
MISSISSIPPI CONFEDERATE PENSION APPLICATIONS
by Betty C. Wiltshire
Pensions were given to soldiers and their widows for Civil War service. Most were given after 1900. For widows, it generally gives the husband's name, date and place of marriage, and date and place of husband's death. These books give the pensioner's name, date of application, county of residence, and service unit in most cases. They are listed in alphabetical order.
A-G, 356, pages paperback, $25.00
H-Q, 312, pages, paperback,$25.00
P-Z, 324 pages, paperback,$25.00
You should also check http://www.pioneersoutheast.com/Products/products.html for other states, one or two of which I recall are of interest to you.
Dennis