English: As Endenborn lived 1848–1926, this undated photo is likely from ca. 1880–1900, given the apparent age of the subject; certainly well before 1923 and thus not subject to copyright.
Licensing
Public domainPublic domainfalsefalse
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{{Information |Description={{en|1=This photo of William Endeborn is found on findagrave.com. It was submitted by a historian named Eric J. Brock. Endenborn died in 1926; this should be a 1900-1910 photo but is undated, well before 1923.}} |Source=Not know