On Sat, 4 Mar 1995, (Mike Polk) wrote:
 
> You should also check the following comprehensive reference on this subject:
>
> Roenke, Karl G.
>   1978  Flat Glass: Its Use as a Dating Tool for Nineteenth Century
>      Archaeological Sites in the Pacific Northwest and Elsewhere.
>       Northwest  Anthropological Research Notes, Memoir No. 4.
>      (University of Idaho, Moscow series).
>
> This was a thesis done by this person which was published in this series
> which should be available in any good research library.
>
> Mike Polk
>
 
 
I also suggest Karl's work.  I have applied it with some success in the
Middle Atlantic region.
        Silas D. Hurry
        Historic St. Mary's City