Are Polonium Halos in Coalified Wood Evidence for the Flood?
- The author offers other explanations for the dual 210Po halos in coalified wood other than those proposed by Gentry, and these explanations utilize natural causes rather than miracles.
- http://www.csun.edu/~vcgeo005/wood.html

"Polonium Halos" Refuted
- Professional geologist Tom Bailleul argues that there is no good evidence for Gentry's claimed polonium halos.
- http://www.talkorigins.org/faqs/po-halos/gentry.html

Tiny Mystery Home Page
- Refutation of Robert Gentry's claim that polonium halos are evidence of instant creation. "The geological setting of these sites shows conclusively that Gentry's notion of an 'instantly created' earth composed of granite is false."
- http://www.csun.edu/~vcgeo005/gentry/tiny.htm