These would generally need to be OCR'd and then put into a git repository where they could be queried, versioned, and repaired as needed for parsing into a structured format.
I've got the above committee proceedings archived. Currently can't find them on the new NRCS drupal site. Might need to try tio OCR them and store in a dedicated repo soon.
ICOMLAC International Committee on Low Activity Clays https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/class/taxonomy/?cid=stelprdb1262264
ICOMMOTR International Committee on Soil Moisture and Temperature Regimes https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/class/taxonomy/?cid=stelprdb1267281
ICOMAND International Committee on Andisols https://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/survey/class/taxonomy/?cid=stelprdb1264335
etc.
These would generally need to be OCR'd and then put into a git repository where they could be queried, versioned, and repaired as needed for parsing into a structured format.