Gretchen Woelfle Books

Katje the windmill cat

By Gretchen Woelfle

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Katje the windmill cat

By Gretchen Woelfle

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When a dike breaks during a violent storm, flooding a little Dutch town, Nico's baby is saved by his heroic cat.

Katje the Windmill Cat

By Gretchen Woelfle

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Jeannette Rankin

By Gretchen Woelfle

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The author has collected photographs, newpaper clippings, campaign materials, and other historical documents to tell the story of the first congresswoman in American history.

The Wind at Work

By Gretchen Woelfle

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Animal Families Animal Friends

By Gretchen Woelfle

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Jeannette Rankin

By Gretchen Woelfle

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The author has collected photographs, newpaper clippings, campaign materials, and other historical documents to tell the story of the first congresswoman in American history.

Write on Mercy

By Gretchen Woelfle

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Provides a biography of Mercy Otis Warren, an unsung heroine of the American Revolution, who wrote patriotic plays and poems, including a history of the Revolution. This picture book provides a bi...

Answering the Cry for Freedom

By Gretchen Woelfle Illustrated By R. Gregory Christie

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Uncover the lives of thirteen African-Americans who fought during the Revolutionary War.   Even as American Patriots fought for independence from British rule during the Revolut...

Mumbet s Declaration of Independence

By Susie Berneis, Gretchen Woelfle

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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.