There is now a cover shot of the German translation of the combined edition of White Sands Incident and To Men of Earth, first published in the U.S. by Franklin Thomas. The book contained a picture of his business card which is also now available.
You can find the cover shot on the Daniel’s Writings -> White Sands Incident page, and the business card can be viewed on the Daniel’s Writing -> Misc. page.
Cheers, Sean