Pre 1997 metadata is not in system (SitesDB in Australia)<br /></p><p><br /></p><p><ul><li>Hard copy station history files  </li><br /></p><p><li>Instrument registers (pre 1920)  </li><br /></p><p><li>Observer instructions/guides/procedures  </li><br /></p><p><li>Instrument test reports  </li><br /></p><p><li>Organisation annual reports and similar documents  </li><br /></p><p></ul><br /></p><p>Changes in instruments are usually documented. Land use etc. may not be.<br /></p><p>Hard copy station inspection reports <br /></p><p><br /></p><p>Many types of evidence are hard to capture in a codified way. Need to be able to reference and attach human-readable documents to site metadata.<br /></p>