The Dallas Public Library offers a limited reference service through the US mail. They charges a $10.00 nonrefundable research fee that entitles you to 30 minutes of staff time and up to 2 photocopies (additional photocopies are $1.00/page). They will also provide copies of obituaries.
See the Mail Reference Requests and the Obituary Requests sections at http://dallaslibrary2.org/genealogy/mailReference.php for more information.
