File talk:Ludwig Wittgenstein.jpg
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Updated URL for the source
[编辑]The original URL https://www.bildarchivaustria.at/Pages/ImageDetail.aspx?p_iBildID=13887013 no longer exists (https://onb.digital/result/BAG_13887013 "Item does not exist", as of April 29, 2021):
A valid reference must therefore read:
see Internet Archive: https://web.archive.org/web/20191101000000*/https://www.bildarchivaustria.at/Pages/ImageDetail.aspx?p_iBildID=13887013
-- Feyth (留言) 14:25, 29 April 2021 (UTC)