Robert Elmer Books

Caso Cerrado Para Ninos Off My Case for Kids

By Robert Elmer, Lee Strobel

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About Face Space Race AstroKids

By Robert Elmer

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A way through the sea

By Robert Elmer

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In 1943, when the Germans plan to send all Danish Jews to prison camps, Peter and Elise, eleven-year-old twins, face danger trying to help their Jewish friend Henrik escape to Sweden.

Beyond the river

By Robert Elmer

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While visiting their cousins' farm on the west coast of Denmark in the summer of 1944, eleven-year-old twins Peter and Elise learn the power of prayer as they work to rescue a downed British pilot.

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.