Preben Sejer Kristensen Books

A family in China

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Text and photographs present the home, work, school, recreation, and day-to-day activities of the Chen family who lives in a city in the Guangdong province of China.

A family in France

By Peter Otto Jacobsen

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A family in Mexico

By Peter Otto Jacobsen

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A Family in Holland Families Around the World

By Peter Otto Jacobsen, Preben Sejer Kristensen

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A Family in Colombia Families Around the World

By Peter Otto Jacobsen, Preben Sejer Kristensen

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Family in the Persian Gulf

By Peter Otto Jacobsen

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A family in West Africa

By Peter Otto Jacobsen

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Family in Hong Kong

By Peter Otto Jacobsen

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A family in Switzerland

By Peter Otto Jacobsen

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A Family in China Families Around the World

By Peter Otto Jacobsen, Preben Sejer Kristensen

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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.