Ruth Hooker Books

Gertrude Kloppenberg II.

By Ruth Hooker

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A lonely little girl keeps a diary in which she records her search for "a true blue friend."

Kennaquhair

By Ruth Hooker

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Having escaped robot-like from a holocaust, six children find their way to a livable valley where an old man helps them become independent individuals, yet able to work together.

At Grandma and Grandpa's house

By Ruth Hooker

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At Grandma's and Grandpa's house there are always special things to see and do.

The pelican mystery

By Ruth Hooker

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A resourceful brother and sister find adventure and mystery in the Florida Keys.

Sara loves her big brother

By Ruth Hooker

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Two-year-old Sara's devotion often exasperates her patient big brother.

Gertrude Kloppenberg (private)

By Ruth Hooker

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A lonely little girl keeps a diary in which she records her search for a "true blue friend."

The kidnapping of Anna

By Ruth Hooker

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A brother and sister uncover a sinister kidnapping plot when their family moves into a strange house over Christmas vacation.

Matthew the cowboy

By Ruth Hooker

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After receiving a cowboy suit for his birthday, Matthew takes an imaginary trip out West where he tames a wild horse, solves the puzzle of a mysterious cattle brand, and captures some rustlers.

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.