When was the first official use of the term 'minifigure' or 'minifig'? When did The LEGO Group first use the term minifigure? Have they been called that since their introduction in 1978?

Similar to this question: 
Why are they called &quot;minifigs&quot;?
I kept searching and found out for myself :). The US magazine from 1979 calls them Mini-Figures, even the version without arms.

http://www.peeron.com/catalogs/1979/medium/6/?id=97
http://www.peeron.com/catalogs/1979/medium/10/?id=97