Ruy Barbosa Books

Spectacle entertainments of early imperial Rome

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"The presentations in the theater, gladiatorial combats, chariot races in the circus, animal hunts, triumphal processions, and other public entertainments of early imperial Rome served as tangible...

Parlamentarismo e presidencialismo na Republica brasileira

By Silvio Romero

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O liberalismo e a Constituicao de 1988

By Ruy Barbosa

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A imprensa e o dever da verdade

By Ruy Barbosa

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Discurso no Instituto dos Advogados Brasileiros

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O liberalismo demiurgo

By Vera Teresa Valdemarin

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O parlamentar Rui Barbosa

By Artur Adolfo Cotias E. Silva

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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.