"Includes five SAT words to know"--cover. "America's national mystery book series"--cover.
Summary:
"Christina, Grant, Mimi and Papa snowmobile into Yellowstone National Park to encounter mud pots, geysers, bison, beauty, bears, volcanic action, and a mystery of historic proportions!"--p.[4] of cover.
Series:
Real kids, real places series ; 34 Carole Marsh mysteries Marsh, Carole. Real kids, real places series.
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