Biert was a separate municipality between 1817 and 1855, when it became part of Geervliet.[1]
References
^Ad van der Meer and Onno Boonstra, "Repertorium van Nederlandse gemeenten", KNAW, 2006. "KNAW > Publicaties > Detailpagina". Archived from the original on February 20, 2007. Retrieved December 3, 2009.