div class=trans-pagebuttonPage 1button div class=trans-image amp-img class=trans-thumb alt=Page 1: Gibbsite in Altered Granitic Rock in North Wales src=https:reader036fdocumentsinreader036viewer20220721175750682a1a28ab0f07aee8bfhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divp© 1964 Nature Publishing Grouppdivdiv class=trans-pagebuttonPage 2button div class=trans-image amp-img class=trans-thumb alt=Page 2: Gibbsite in Altered Granitic Rock in North Wales src=https:reader036fdocumentsinreader036viewer20220721175750682a1a28ab0f07aee8bfhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-img divp© 1964 Nature Publishing Grouppdiv