What is the best way you've found to manage the physical rbook? Shelves? Bins? They are so heavy and cumbersome! I've taught Read180 for 6 years and every year I've tried something new. They've all been 'ok' solutions but I'd love some suggestions! I'm looking for an easier way to visually know which rbooks go with each class and group. Color coding bins and shelves is the closest I've gotten but they somehow still manage to place their book in/on the wrong place! To be honest, my back just can't take lugging 80 rbooks around the room anymore. Thanks for your suggestions in advance!