These are 40+ years old and incomplete encyclopaedia set.

I’ve kept them because I like seeing how the knowledge has changed over the years and also because I thought that, even if they were pretty much useless, they could be a source of pictures for the kids for use in school projects. All the images we need, we just pull off the Internet. Looking up stuff in books is very old school.

I likely picked them up cheap at some school or church bazaar.

There are four books in each image (click for a larger image).