Craig's source of White Oxheart was Reinhard Kraft. For many years we have both traded with him and a couple of my current SSE listings are varieties from him as well.
I don't have my 2006 SSE Yearbook here by me but no doubt it was probably listed by Neil Lockhart , since Neil also trades with him.
I'll check later when I'm in the back room, aka my tomato office cum TV and book reading area with a large sliding door that faces a section of the backyard so I can keep track of the deer.
Carolyn