Plastic 33 1/3 story records from educational books in the 50’s and 60’s

My mum had these books in the 1950’s and 60’s and they each came with a little coloured see through record in the back. They are really flimsy but played perfectly! They got passed down to me and were probably the most useful source of information I ever had to complete school projects with. Who would have thought such tiny records could hold such valuable information. Everything I learned about the United Nations and Abraham Lincoln came from these little coloured beauties!