August Bernhard Hasler Books

How the Pope became infallible

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In a moment of candor and humility, the late Pope Paul VI admitted that the papacy itself - and specifically the doctrine of papal infallibility, fought for so relentlessly by his predecessor, Pius...

Wie der Papst unfehlbar wurde

By August Bernhard Hasler

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Pius IX. i.e. der Neunte (1846-1878), papstliche Unfehlbarkeit und 1. Vatikanisches Konzil

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Como Llego El Papa a Ser Infalible

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Wie der Papst unfehlbar wurde

By August Bernhard Hasler

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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.