I am not saying these books should replace the more scientific and serious books you will use as resources for learning with your children, but these are certainly a fun thing to add to your reading selection on a variety of subjects. We have used many of them, they are factual, and filled with the usual Dr. Seuss styled rhyming fun (though, they are not written by Dr. Seuss himself). And why not add a little humor to learning?I often stick them into our reading selection on a particular subject, usually as a lead in to the topic because they are a lighthearted way to start, and Damian finds them appealing and easy to follow as well. I have purchased a couple packets of these books from Costco (they usually come in bundles of three for about $10.99, if my memory serves me correctly), but they are also available from Amazon, and probably your local library. They cover a large selection of subjects: various animal families, weather, maps, the human body, money, the solar system, plant life, etc so they are easy to work into many topics of learning.
I purchased these books myself and am sharing them with you because we enjoy using them. Amazon links are affiliate.