" Jahresberichte der geschichtswissenschaft, Volume 13" van Historische Gesellschaft zu Berlin
" Kunstgeschichtliche Charakterbilder aus Österreich-Ungarn" van Albert Ilg en Moritz Hoernes; " Marburger Jahrbuch für Kunstwissenschaft, Volumes 11-12"
When copying data from this family tree, please include a reference to the origin: Klaas Pera, "Family tree Helmantel", database, Genealogy Online (https://www.genealogieonline.nl/stamboom-helmantel/I9813.php : accessed May 2, 2024), "Agnes N. N.".
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