Regarding the quality, Sunday River Productions always shot excursions and such on 16mm film, and used others 16mm films for their productions. They actually were one of the first in the business to sell their programs on super 8 or 8mm movies you could watch at home. Then they had to convert everything to VHS Video, and when DVD came along I think they kinda retreated, since you don't see their ads much anymore. Alva Morrison was Sunday River Productions. I met him on several occassions in the 70's and early 80's.
He also did several other NG shows as I recall, including one on the RGS which I think I bought my dad for Christmas one year. It was all B&W but of course rare footage.
Greg