Marshall E. Ostrow Books

Goldfish

By Marshall E. Ostrow, Barrons

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Goldfish

By Marshall Ostrow, Marshall E. Ostrow

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A practical guide for keeping goldfish, with information on aquarium maintenance, varieties of goldfish, their purchase and daily care, breeding, diseases, and outdoor pools.

Breeding Hamsters

By Marshall E. Ostrow

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Bettas

By Marshall E. Ostrow

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Breeding Hamsters

By Neil Pronek, Marshall E. Ostrow

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Goldfish Complete Pet Owner s Manuals

By Marshall E. Ostrow

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Breeding Killifishes

By Marshall E. Ostrow

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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.