6 copies of How Many? Looks at numbers of people riding on a bike, in a boat, and in a car.
6 copies of Legs. Legs teaches counting by two by counting the legs of animals.
How many eggs are in the hay? This counting-by-ones book includes ordinals.
Two brothers sort a basketful of socks, matching colors and making pairs and counting by twos.
6 copies of Counting Concept Book