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|- valign="top"
|align="center" width="20%" style="background:#efefef;" | <!-- Content Column 1 starts here -->
<!-- {|style="height:140px; background:#efefef"
|align="center" valign="top"| {{Icon|file=rota_sludge_well_drilling_icon.png|alt=Understanding groundwater and wells|width=94|link=Understanding groundwater and wells}} <br> [[Understanding groundwater and wells]]
|}-->
{|style="height:140px; background:#efefef"
|align="center" valign="top"| {{Icon|file=rota_sludge_well_drilling_icon.png|alt=Manual drilling general|width=94|link=Manual drilling general}} <br> [[Manual drilling general]]
