I tend to use Jim Rock and David Gillio et al. as a reference for 
manganese inclusion in glass, 1880 to about 1915.  I can't tell you off 
the top of my head, though, which source provided which date, or if 
they both designated the start and end dates.  I don't have the papers 
at my fingertips at the moment.

Gillio, David et al.
        n.d.    Glass Bottles.  In Some Common Artifacts Found at Historical 
Sites.  Illustrated by Joanna Wilson            and Gigi Bayliss.  A Cultural 
Resource Report: 13-19.

Rock, Jim
        1981.  Glass Bottles: Basic Identification.  Manuscript on file, 
Klamath National Forest, Region Five.

Also I have a paper in front of me that clearly provides both dates 
1880-circa 1915:

Hurst, Gwen J.
        1986.  U.S. Bottle Glass Chronology.  Revised 1996.  Honolulu, Hawaii: 
B.P. Bishop Museum, 4.

  Hurst refers, in turn, to another source:

Munsey, Cecil
        1970.  The Illustrated Guide to Collecting Bottles.  New York, New 
York: Hawthorne Books.

Obviously, many of these papers are widely circulated, but I imagine 
that it could be difficult to obtain copies.  I really appreciate all 
of the work being done to make reports more accessible electronically.  
Hope this helps!

Andrea Marroquin

On Sep 22, 2004, at 12:13 PM, Cathy Spude wrote:

> HISTARCHers:
>
> I'm looking for a citation for the end date of the use of manganese to
> clarify glass in the United States. Dale Berge in his still relevant 
> report
> on the Simpson's Springs excavations in Utah tells us it was 1917, 
> based on
> a collector's book (Ferraro and Ferraro 1964). I have "known" for some
> years now that the United States stopped importing manganese from 
> Germany
> as early as 1915 and that is a better end date for glass that solarizes
> purple. I've used that date for some time now, but a reviewer on one 
> of my
> reports wants a citation (*&#!*#!!!). I've gone through all my standard
> references and can't find anyone else who will back me up.
>
> Anyone who can help?
>
> Cathy
>
>
> Catherine Holder Spude ¨ Archeologist ¨ Cultural Resources Management ¨
> National Park Service – Intermountain Region ¨ 505.988.6831Voice ¨
> 505.988.6876 Fax
>  The National Park Service cares for special places saved by the 
> American
>               people so that all may experience our heritage.
>
>