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- <script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-plugins/1.6.1/control/Permalink.Overlay.js"></script>
+ <link rel="stylesheet" href="https://unpkg.com/leaflet@1.3.0/dist/leaflet.css" integrity="sha512-Rksm5RenBEKSKFjgI3a41vrjkw4EVPlJ3+OiI65vTjIdo9brlAacEuKOiQ5OFh7cOI1bkDwLqdLw3Zg0cRJAAQ==" crossorigin="anonymous" />
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+ <script src="https://cdnjs.cloudflare.com/ajax/libs/leaflet-plugins/3.0.2/control/Permalink.Overlay.min.js" integrity="sha256-xoP/txAKIYDr3MjZh1f2qtNn8lEa6zmhhkPxoejGgQM=" crossorigin="anonymous"></script>