<li><a class="nav-link" href="#overview">Overview</a></li>
<li><a class="nav-link" href="#license">License</a></li>
<li><a class="nav-link" href="#acknowledgements">Acknowledgements</a></li>
</ul>

      <div class="book-extra">
        <ul class="list-unstyled">
<li><a id="book-source" href="https://github.com/OpenGeoHub/spatial-sampling-ml/blob/master/index.Rmd">View source <i class="fab fa-github"></i></a></li>
          <li><a id="book-edit" href="https://github.com/OpenGeoHub/spatial-sampling-ml/edit/m