Here is the link to a peer-reviewed paper (and abstract), which I co-authored earlier this year, with Dr. Sue Baldwin, on public composting toilets.  
I can provide academic or research colleagues with a free copy.  Please email me if you would like one.  
Questions regarding this paper can be directed to me at this email address.  
I believe Capt. John Leffel purchased a copy.  I am not familiar with the copyright laws on the matter of internal sharing, but if you are a US NPS employee, it is possible that John may be allowed share this copy with you.
I am nearing the end of my PhD on this topic and have a number of other relevant manuscripts that I will make available in due time.
Geoff Hill