<?xml version="1.0" encoding="utf-8"?>
<rdf:Description rdf:about="https://catalogues.royalsociety.org:443/CalmView/record/catalog/EL/M1/41" xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:dc="http://purl.org/dc/elements/1.1/">
  <dc:title>Extract of a letter, from John Muralt of Zurich to Theodore Haak</dc:title>
  <dc:description>Concerning the crystal-producing mountains in Switzerland
Read to the Royal Society on 31 December 1668</dc:description>
  <dc:date>1668</dc:date>
</rdf:Description>