Peter Tonkin Books

Deep in the darkest reaches of the East China Sea, the remote vessel Neptune edges through the utter blackness along the Ryuku Trench, guided by the steady hands of Richard and Robin Mariner. The M...

Thunder Bay

By Peter Tonkin

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The Point of Death

By Peter Tonkin

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One Head Too Many

By Peter Tonkin

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Wolf Rock Richard Mariner Adventure

By Peter Tonkin

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Cape Farewell

By Peter Tonkin

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When Richard Mariner's tug Sisyphus is hit by a huge rogue wave off the Greenland coast, only superb seamanship and good luck save her. The vessels ahead of Sissy are not so fortunate and an ever-m...

High wind in Java

By Peter Tonkin

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Richard Mariner is out to buy the revolutionary vessel Tai Fun, but not if multi-millionaire eco-warrior Nic Greenbaum has his way. The situation is further complicated when the tiny island of Pula...

Dead sea

By Peter Tonkin

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"An ambitious ecological experiment plunges Richard and Robin Mariner in deadly waters ... Heritage Mariner and Greenbaum International have financed an ecological experiment to prove how swiftly r...

Black pearl

By Peter Tonkin

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Richard Mariner leads a team into the heart of an African jungle to find an incalculable fortune in minerals in a territory claimed by a guerrilla army.

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.