We had Britannica (old set circa 1950’s), World Book and Colliers (both 1960’s).......................
our Britannica was pretty old too- not sure what year though- We also had a Britannica like set of just animals-
Read most of that too - to this day an animal will be shown on TV aND pieces of info/facts about said animal will pop into my head about them- useless knowledge but fun-