10:2010:20, 27 December 2012diffhist+2,341
Polio
links corrected (there is no point asking for recent refs, when it's about history on a topic on which there was no recent researches.)
10:2010:20, 27 December 2012diffhist+2,341
Polio
links corrected (there is no point asking for recent refs, when it's about history on a topic on which there was no recent researches.)