Karl Ruhmann Books

Who will go to kindergarten today

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Sam decides to send his toy monkey Timbo to kindergarten in his place, but after telling Timbo about his school friends and what his day is really like, he realizes he wants to go himself.

But I want to!

By Karl Ruhmann

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When his mother says "No!," a young boy thinks of all the wonderful things he could do if he sent her to the moon, but then he realizes he wants her around, especially to read bedtime stories.

Who will go to school today?

By Karl Ruhmann

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Sam decides to send his toy monkey Timbo to kindergarten in his place, but after telling Timbo about his school friends and what his day is really like, he realizes he wants to go himself.

The little Christmas tree

By Karl Ruhmann

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A young fir tree hates feeling small and useless, but as winter falls and Christmas approaches a small boy and his family discover that the tree is the perfect size for something very special.

The little Christmas tree

By Karl Ruhmann

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A young fir tree hates feeling small and useless, but as winter falls and Christmas approaches a small boy and his family discover that the tree is the perfect size for something very special.

The fox and the stork

By Karl Ruhmann

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When sly Fox invites hungry Stork to lunch but tricks her out of her portion, she devises a way to get the last laugh.

Filbert flies

By Karl Ruhmann

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Filbert is blissfully flying along when a cantankerous sea gull brings him down, literally, with the reminder that penguins cannot fly.

Fuchs und Storch

By Karl Ruhmann

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When sly Fox invites hungry Stork to lunch but tricks her out of her portion, she devises a way to get the last laugh.

Wolf und Abel

By Alessandra Roberti, Sergio Lairla, Karl Ruhmann

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El viejo lobo

By Lorenzo Rodriguez Lopez, Karl Ruhmann, Maria Stalder

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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.