RE: [TexasCzechs] Texas Veterans Land Board
This gives me some starting points.
Believe it or not, The Texas General Land Office provides one of the best websites for Texas Veterans. A link to The Texas Veterans Land Board is below. I couldn't find a specific item but there are a number of contact sources here that can probably help.
There is a national organization for what you want but I haven't found it yet. I'll keep trying.