(sources)
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		| Concerned Citizen Key | Harden Worksheets | Zodiac Correspondences | 
	
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Sources for handwriting samples:
              
Concerned Citizen Key:
Hardens Worksheets:
Zodiac Correspondences:
I tried to limit samples to the correspondences that are considered to be "authentic" Zodiac communications:
 
	- Vallejo Times - Herald Letter - July 31 1969
- San Francisco Examiner Letter - July 31 1969
- San Francisco Chronicle Letter - July 31 1969
- San Francisco Chronicle Letter - Received August 4 1969
- Zodiac Message on Car Door - Lake Berryessa - September 27 1969
- San Francisco Chronicle Letter - October 13 1969 Re: Murder of Paul Stine
- San Francisco Chronicle Dripping Pen Card & 340 Cipher - November 8 1969
- San Francisco Chronicle Letter - November 9 1969
- Melvin Belli Letter - December 20 1969
- San Francisco Chronicle "My Name Is" Letter - April 20 1970
- San Francisco Chronicle "Dragon Card" - April 28, 1970
- San Francisco Chronicle Map Code Letter - June 26 1970
- San Francisco Chronicle Johns Letter - July 24 1970
- San Francisco Chronicle "Little List" Letter - July 26 1970
- San Francisco Chronicle Pace Card - October 5 1970
- San Francisco Chronicle Paul Avery Halloween - October 27 1970
- Los Angeles Times Letter - March 13 1971
- San Francisco Chronicle Lake Tahoe card - March 22 1971
- San Francisco Chronicle Exorcist Letter - January 29 1974
- San Francisco Chronicle SLA Card - received February 14 1974
- San Francisco Chronicle Badlands card - May 8 1974
- San Francisco Chronicle Count Marco Red Phantom Letter - July 8 1974
- All of the above can be found here.