Rudolf Hopfner Books

Franz Geissenhof und seine Zeit

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Not long after his death Franz Geissenhof (1753-1821) was being honored with the title "the Stradivari of Vienna"; today he is considered the leading violin maker of the Vienna Classic period. His...

Die Sammlung alter Musikinstrumente

By Alfons Huber, Beatrix Darmstadter, Rudolf Hopfner

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"As part of then then Imperial House's Art Historic Collections, Julius von Schlosser established the Collection of Historic Musical Instruments in 1916 as an autonomous collection and exhibition v...

Streichbogen

By Rudolf Hopfner

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Wiener Musikinstrumentenmacher: 1776 - 1900 Adressenverzeichnis und Bibliographie

By Rudolf Hopfner

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Meisterwerke der Geigenbaukunst

By Rudolf Hopfner

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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.