Skaf - tuleň / Skaf - the Seal, by Lída Durdíková, illustration by Rožankovský, published in Prague 1939.
I bought this book for the little guy before he was born. I had time to search for good-looking books back than. The book is very educational, I learned a lot on the life of seals while reading it to the little guy. Some parts were scary, though. Killing the seal by the Eskimos, for example. They also sang a freaky ritual song. There is a colored illustration on each double page. I like colored illustrations in the books for adults, too. And it has become so rare.