Find A Grave
On this website I found an entry for George Corner Pence. It has links to the Smith's, Boyer's, and Schwarck's; and includes photographs of each person and of the gravestone.
Check it out!

1900 Census Record for John Schwarck who was the father of Alonzo Lyman Schwarck who married Ada Ethel Smith who was the daughter of Elias Smith Jr. who was the grandfather of Harvey Alonzo Pence.

Ada Ethel Smith Schwarck was the daughter of Elias Smith Jr. She married Alonzo L. Schwarck. Alonzo and Ada had a farm in Melrose Township, Grundy, Iowa, USA. This is the farm that Harvey Alonzo Pence lived on after George Corner passed away.