Robert Quackenbush Books

Henry's Awful Mistake

By Robert Quackenbush

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Piet Potter's First Case

By Robert M. Quackenbush

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A boy detective uses a blank sheet of paper, a key, and a subway map to help a neighbor solve a puzzling message in a will.

Piet Potter Returns

By Robert M. Quackenbush

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Piet Potter to the Rescue

By Robert M. Quackenbush

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Amazing boy detective Piet Potter races against time to save a public event from ruin, although he has only a series of mysterious phone calls as clues.

Piet Potter Strikes Again

By Robert M. Quackenbush

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Piet Potter, the amazing boy private eye, sets out to discover who is trying to sabotage a neighbor's birthday party.

Piet Potter on the Run: Story and Pictures

By Robert M. Quackenbush

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A mysterious envelope, mistakenly placed in his motel pool locker, launches amazing boy detective Piet Potter on a chase across Manhattan which ends at the United Nations.

Piet Potter's Hot Clue: Story and Pictures

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Ahoy! Ahoy! Are You There

By Robert M. Quackenbush

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A humorous account of events in the life of the inventor of the telephone.

The Beagle and Mr. Flycatcher: A Story of Charles Darwin

By Robert M. Quackenbush

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Relates how Charles Darwin began his career as an unpaid naturalist aboard the brig H.M.S. Beagle on a five-year voyage around South America, during which he began to formulate his revolutionary th...

Bicycle to Treachery

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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.