These obits are going to be a challenge to find because of when they died. I'd contact the Garland Landmark Society, www.garlandhistorical.org/
and ask if there is an organization in town that you can order copies from.
There isn't a genealogical society in Garland and the Dallas Genealogical Society doesn't do research. You can contact your local public library and ask them to find the applicable newspaper on microfilm via inter-library transfer. Successful Searching!