In it, you referred to Oliver Barthel as Oliver "Otto" Barthel, suggesting his nickname was "Otto".
That is, in fact, in error. Oliver Barthel was the youngest of three brothers; Theodore EA Barthel (my great grandfather) born 1874, Otto F Barthel born 1876, and Oliver E Barthel born 1877. He was never referred to as Otto, as that was his older brother.
As the article is 14 years old, there's no harm in the error. I just felt that, for your edification, you would like to know. Todd Barthel