According to The Daily Pen, the coding information for 1961 from the Vital Statistics Information Manual cannot be found online, but through your state’s Dept of Health archive. That is how The Daily Pen obtained their copy.
Also, according to info that was provided by the National Center for Health Statistics ( NCHS), the coding that was used in 1961 was used until the 1970 Census, as that was the purpose for the coding.
Where did this online manual come from?
Nevermind about the question of the manual; I was looking at two sites at once and got mixed up.
My mistake.