TY - CONF A1 - Helmerich, Rosemarie A1 - Bien, J. A1 - Niederleithinger, Ernst A1 - Kubiak, Z. T1 - Condition assessment of old railway bridges, a scientific cooperation between Berlin and Wroclaw T2 - 3rd Int. Congress on Construction History T2 - 3rd Int. Congress on Construction History CY - Cottbus, Germany DA - 2009-05-20 PY - 2009 AN - OPUS4-19563 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -