Marthe Jocelyn Books

The Invisible Harry

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Despite her mother's edict against pets in the apartment, eleven-year-old Billie is unable to resist a homeless puppy and enlists the help of her scientific friend Jody in making the little dog inv...

Hannah and the seven dresses

By Marthe Jocelyn

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Hannah can never decide which of her beautiful dresses she should wear, and on her birthday she trys wearing them all at once.

Earthly Astonishments SE

By Marthe Jocelyn

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The Invisible Enemy

By Marthe Jocelyn

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Sixth grader Billie finds her life complicated when a cute boy from Montreal transfers to her school and her enemy Alyssa accidentally uses her vanishing powder.

Would You Turtleback School Library Binding Edition

By Marthe Jocelyn

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Hannah s Collections

By Marthe Jocelyn

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The Invisible Day

By Marthe Jocelyn

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Aggie Morton, Mystery Queen: The Dead Man in the Garden

By Isabelle Follath, Marthe Jocelyn, Marthe Jocelyn Illustrations By Isabelle Follath

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For young detective Aggie Morton and her friend Hector, a spa stay becomes a lot more thrilling when TWO dead bodies are found in this third book in the Aggie Morton, Mystery Queen series, inspired...

Aggie Morton, Mystery Queen: The Seaside Corpse

By Marthe Jocelyn, Marthe Jocelyn Illustrations By Isabelle Follath

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For young detective Aggie Morton and her friend Hector, an opportunity to dig up fossils becomes even more thrilling when a corpse washes ashore in this fourth book in the Aggie Morton, Myster...

Aggie Morton, Mystery Queen: The Seaside Corpse

By Marthe Jocelyn, Marthe Jocelyn Illustrations By Isabelle Follath

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For young detective Aggie Morton and her friend Hector, an opportunity to dig up fossils becomes even more thrilling when a corpse washes ashore in this fourth book in the Aggie Morton, Myster...

How to Convert ISBN-10 to ISBN-13 (and Vice Versa): A Complete Guide

If you’re in the world of books—whether as a publisher, librarian, bookseller, or avid collector—you’ve likely come across the terms ISBN-10 and ISBN-13. Understanding these formats and knowing how to convert between them is essential for maintaining consistency and compatibility in book records. In this post, we’ll cover everything you need to know about ISBN conversions, step by step.

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.