Black Treasure (A Sandy Steele Adventure)

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Sandy Steele and Quiz Taylor constructed an oil res­ervoir analyzer as their entry in the Science Fair. They didn’t win first prize, but they were of­fered summer jobs in the oil fields of Four Corners. This book is the story of that action-packed summer. As the boys search for oil and uranium, they must unmask a dangerous masquerader!

The Sandy Steele Adventure Series, originally published in 1959, is a thrilling set of mysteries in the spirit of the Hardy Boys and The Three Investigators. Great fun for young mystery readers and fans of classic mystery fiction!