Thanks Allen for mentioning "Telling Time for Archaeologists" article in
Northeast Historical Archaeology (2000).  I wrote this article along with
Patricia Samford, Ellen Shlasko and Andrew Madsen.  The Council for
Northeast Historical Archaeology in conjunction with URS Corporation is
publishing a poster based on this article that gives the dates and
illustrates some twentieth century artifacts.  The poster is titled "
Telling Time in the Twentieth Century" and will be available at the fall
meetings of CNEHA and probably at the SHA Meetings in January.

George L. Miller
URS Corporation
Florence, New Jersey