David Hailey’s “Analysis”
You may (or may not) find this interesting.
http://littlegreenfootballs.com/weblog/?entry=12909_David_Haileys_Analysis_is_a_Fraud#comments
On the Hailey website you are able to see the before and after image files with the superscript “TH” missing and not missing. These image files were most likely not meant for the viewing public, but there they were.
this link http://imrl.usu.edu/bush_memo_study/supporting_material/bush_with_typewri.gif shows the missing “TH”.
But this link:http://imrl.usu.edu/bush_memo_study/supporting_material/bush_04_May_72_large.gif
magically has the “TH” on it.