Fact books for children about coins (as in collecting/foreign coins) or seashells

[Cagliostro]

Any recommendations please? Not having much luck for either! :)

Have a search on Amazon. There's a Collins Gem Seashore or a big Dorling Kindersley Shells of the World but that's pricier. Both publishers are usually very reliable. There's a coins of the world book too but I don't recognise the publisher on that one.