Harry Frederick Keller
15 December 1861 – 5 February 1924
American chemisty, head of the Department of Physical Sciences at Central High School in Philadelphia, and Principal of the Germantown High School in Philadelphia.
15 December 1861 – 5 February 1924
American chemisty, head of the Department of Physical Sciences at Central High School in Philadelphia, and Principal of the Germantown High School in Philadelphia.
