RT Book, Whole DB /z-wcorg/ DS http://worldcat.org ID 40359254 LA English T1 Dave's down-to-earth rock shop A1 Murphy, Stuart J.,, Smith, Cat Bowman,, PB HarperCollins PP New York, NY YR 2000 SN 0060280182 9780060280185 0060280190 9780060280192 0064467295 9780064467292 0329145789 0758760639 9780329145781 9780758760630 0613214099 9780613214094 AB As they consider sorting their rock collection by color, size, type, and hardness, Josh and Amy learn that the same objects can be organized in many different ways.