Henry Hassenplug- Union Co., Pennsylvania

I am doing some research on my granddaughter's ancestors Henry Hassenplug and his first wife, Catherine Steme.I am not sure at all of the spelling of her surname.Henry was the son ofJohann Heinrich Hassenplug (Hassenpflug) and Anna Maria Seebold.I am very interested in knowing when Henry and Catherine were married and also the correct spelling of her name ... and of course, any other information regarding her.