Gustave A Keller 
Gustave was born in November 1850 in Germany.Birth Notes
by 1900 census
General Notes
parents both born in Germany by 1900 census came to US in 1874
They had a son named Percy.
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Children
Birth Notes
by 1930 census, 1893 by death certificate, 1894 by WWI draft card
Percy Stoll Keller
Percy was born on September 27th, 1893 in New Jersey.