Dan Mouer's suggestion to look into John Milner Associate's work was a good
one.  Specifically, JMA worked on a an urban site at Station Square/Mechanic
St., Cumberland, Md. over the winter of '92-'93.  Said site included at least
one, and more probably two, privies from which extensive samples for parasite
analysis were taken.  The results of the analysis are contained in several
appendices to the main report.  I would contact Dana Heck or Charles Cheek at
Milner's Alexandria office (4th floor, 5250 Cherokee Ave., Alexandria, VA -
the zip code escapes me, I'm afraid) for more details and/or a copy of the
report.
 
Alasdair Brooks