From 1911 until 2018, Kaye and Laby Table of Physical and Chemical Constants provided scientists with invaluable data and formulae. In 2019, the National Physical Library announced that they would no longer be updating Kaye and Laby, and its website was replaced with a link to the internet archive version of the site. We have extracted compound-specific information from this archived version and mapped it onto ChemSpider records in order to make this data visible and accessible.