div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: Index to Maps Surficial Geology 1991–2018 Northern sheet · between 1991 and 2018 that pertain to surficial geology industrial minerals and aggregate resources Maps published src=https:reader033vdocumentsusreader033viewer20220416065e347b53bb095b2d352a02efhtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv