Robert W. Trogdon Books

The Letters Of Ernest Hemingway: Volume 4, 1929–1931

By Robert W. Trogdon, J. Gerald Kennedy, Sandra Whipple Spanier, Rena Sanderson, Miriam B. Mandel, Ernest Hemingway, Albert J. DeFazio

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The First Volume Encompasses His Youth, His Experience In World War I, And His Arrival In Paris. The Letters Reveal A More Complex Person Than Hemingway's Tough-guy Public Persona Would Suggest: De...

Ernest Hemingway

By Robert W. Trogdon

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"He fished the deep sea off the coast of Cuba, he hunted big game in Africa and Idaho, he ran with the bulls in Pamplona, he reported on the civil war in Spain and World War II in Europe. He was a...

Ernest Hemingway, a documentary volume

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The Lousy Racket

By Robert W. Trogdon

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Letters Of Ernest Hemingway

By Sandra Spanier, Robert W. Trogdon, Ernest Hemingway

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The letters of Ernest Hemingway

By Ernest Hemingway

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The "first volume encompasses his youth, his experience in World War I, and his arrival in Paris. The letters reveal a more complex person than Hemingway's tough-guy public persona would suggest: d...

The Letters Of Ernest Hemingway: Volume 5, 1932–1934: 1932–1934

By Sandra Spanier, Robert W. Trogdon, J. Gerald Kennedy, Sandra Whipple Spanier, Rena Sanderson, Miriam B. Mandel, Ernest Hemingway, Albert J. DeFazio

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Ernest Hemingway

By Robert W. Trogdon

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Letters Of Ernest Hemingway

By Sandra Spanier, Robert W. Trogdon, Rena Sanderson, Ernest Hemingway

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Letters of Ernest Hemingway 1907 1922

By Sandra Spanier, Robert W. Trogdon, Ernest Hemingway

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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.