I know that several years ago a number of privies were excavated at
Ft. Riley, KS.  I think Kansas State U was involved, but I do not
remember many details.  Someone in the Kansas State Historical
Society could probably put you in touch with the right people - James
 
James Wettstaed   [log in to unmask]
 
Shared Service Archaeologist, Mark Twain National Forest
"all opinions expressed are my own etc."