I've checked the Latter Day Saints CD-ROMs I have and there's no reference to a Robert Bixby (or Bigsbee, Bigsby, Bigsbe, Bixbe, etc.) born in 1911 or in Nevada or with Riley as a second name. These LDS files are by no means complete, but they're big. I also scanned the titles of Family Tree Maker CD-ROMs and there's nothing promising (Nevada doesn't show.) Your best bet will be the 1910 federal census. It's online at Ancestry.com for $25...cheap compared to travelling to a federal archive. Good luck! - Jim