Libraries can never have enough origami books for students!  Origami paper heads the list of useful materials.  This is followed by folding techniques and symbols which are described and illustrated.  The interest level indicated is from grades 1 to 3, however some experience following origami instructions practiced fingers will certainly help young folders avoid frustration.  Each model includes an additional tip.  The books listed for further reading are at a variety of skill levels.  The facthound internet site offers additional origami projects and other crafts and activities for kids.