Deventer Sandrasteeg 4, Kapittelhuis. Projectnummer dendrochronologie (Stichting RING): 2010514

Dendrochronological research project. The measurement series on which the results are based, in part are unavailable. D.J. de Vries and H. Tisje performed the research and produced the initial dating resuls. Bennno Ridderhof (VU) digitized available analog measurement series (2010). E. Jansma was responsible for the digitization and development of the XML-files containing metadata and the original results (2011). Re-analysis by Jansma (2022) could not confirm initial dating results and has shifted the end date (calendar year of last formed ring) of sample DS400021 backwards from AD 1461 (initial result) to 1275.