Harriet Adams Books

Mystery of the Stone Tiger
Mystery of the Stone Tiger

By Harriet Adams

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The Sierra Gold Mystery
The Sierra Gold Mystery

By Harriet Adams

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Mystery of the Stone Tiger
Mystery of the Stone Tiger

By Carolyn Keene, Harriet Adams

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A black-robed ghost roams the streets of the Danas' home town. A tiger stalks the woods on the outskirts of Oak Falls. And the Hilary Museum is plagued by a phantom prowler who seemingly passes t...

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The Sierra Gold Mystery
The Sierra Gold Mystery

By Harriet Adams

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Louise and Jean Dana fly home from Thailand completely unaware of the exciting adventures waiting for them just a few hours away. But even before their plane lands in San Francisco, Louise's preci...

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The Hundred Year Mystery
The Hundred Year Mystery

By Harriet Adams

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A treasure in jewels and gold coins is hidden somewhere on the Beacon College campus! But where is it? And where is the codicil in which John Beacon, founder of the school, revealed its location?...

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The Riddle of the Frozen Fountain
The Riddle of the Frozen Fountain

By Harriet Adams

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Louise and Jean Dana return to Starhurst School, which has been rebuilt after the fire described in an earlier adventure. As usual, the two sisters are eager to tackle a baffling mystery which sud...

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The Secret of the Minstrel s Guitar
The Secret of the Minstrel s Guitar

By Harriet Adams

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The Dana girls take time off from Starhurst School to accompany their Portuguese-American friend Isabel Sarmento and her father to Lisbon, Portugal. Senhor Sarmento has enlisted the assistance of...

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Dawn
Dawn

By Harriet Adams

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Dawn
Dawn

By Harriet Adams

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What is an EAN and How Does it Relate to an ISBN?

If you’ve ever purchased a product online or in a store, you’ve likely come across a barcode. Behind these barcodes lies a standardized system that makes modern commerce possible. Two key codes often encountered are the EAN (European Article Number) and ISBN (International Standard Book Number). But what are they, how are they connected, and why are they so crucial? Let’s explore.

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