One of the main purposes of raised beds is to provide areas of different soils from those which are already present on a site. Even when these installations do not consist of walls within which a different soil brought onto the site has been placed - on top of the existing soil without blending the two different soils together - the alternative practice of taking soil already present and forming it into beds, berms or mounds serves to change the nature of this soil somewhat. By making it warmer for instance. So maybe as a raised bed gardener you are not that limited by what the existing soil is like.

Otherwise two things that could be of interest is where commercial crop production dependent on suitable existing soils being present has taken place and if a county soils map has been produced, can be accessed.

If it were me I would start by trying the nearest USDA Cooperative Extension Service branch office for such information.

Try asking on the Teas Gardening forum here ion the Gardenweb part of Houzz nstead of this very general one.

https://www.gardenweb.com/discussions/txgard