Can you help to identify a series of children's books, please?

[Carruthers]

This is something of a long shot. In fact a very long shot, but in for a penny, in for a pound.

When I was a kid I had a number of books on science and natural history which were part of a series.

Other subjects might have been covered but those are the only ones I remember.

They were soft back, the covers were colour printed as were the illustrations within.

Each book was approximately 11" x 8" and about a quarter of an inch thick.

Now this is where you might be able to help. I did stumble across a reference to the series a few years ago and found out that it was produced by an American publisher, a fact that I had either forgotten or never knew.

I can't find the original reference so if you have any thoughts which could help in identifying these books, please don't keep them to yourselves.

I'd like to find a copy or two from somewhere which I could keep for old times' sake.

Over to you, gentle Dwellars.