div class=ts-pagebuttonPage 1button div class=ts-image a href=https:reader030vdocumentsusreader030viewer20220204055750683f1a28ab0f07af463dhtml5page1jpg target=_blank amp-img class=ts-thumb alt=Page 1: Age and Initial Helium Abundance of Globular Cluster Stars src=https:reader030vdocumentsusreader030viewer20220204055750683f1a28ab0f07af463dhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-imga divp© 1969 Nature Publishing Grouppdivdiv class=ts-pagebuttonPage 2button div class=ts-image a href=https:reader030vdocumentsusreader030viewer20220204055750683f1a28ab0f07af463dhtml5page2jpg target=_blank amp-img class=ts-thumb alt=Page 2: Age and Initial Helium Abundance of Globular Cluster Stars src=https:reader030vdocumentsusreader030viewer20220204055750683f1a28ab0f07af463dhtml5thumbnails2jpg width=142 height=106 layout=responsive amp-imga divp© 1969 Nature Publishing Grouppdiv