Accuracy and physical condition should be the main criteria for judging. Retain works dealing Texas history, based on use, condition and accuracy. Discard all outdated law codes and texts which have been replaced with newer editions. Retain large dictionaries. Discard old grammars.
Currency is very important.
Discard after five years, except for botany and natural history. Nursing and Allied Health. Currency is very important. Discard after ten years. Local History, Genealogy, or Archival material will seldom, if ever, be weeded.