A recent post in the New Mexico Archaeological Council listserve (NMAC) was 
 quite interesting and notes a guide that many may not know about:  
 
Mike Polk
Sagebrush Consultants
Ogden, Utah


NMAC-L  8-19-13 from Jeremy Kulisheck, Forest Archaeologist: 
A couple of  years back, I was frustrated that the Clorox Company no longer 
had their  20th century bottle guide available in an easily printable format
—and  the copy I had was a barely readable 5th or 6th generation  
photocopy. So I went to  their website and pasted together a new guide from 
information spread across  several web pages that can be printed on a single page. 
But I don’t think I ever  shared it with folks on NMAC. So here it is. Print 
it out 11x17  landscape, on a color printer. Ready to fold in half and stick 
in your clipboard  for the field. 
For the full  guide, spread across several web pages, go to 
http://www.thecloroxcompany.com/company/heritage/