L.B. Halstead Books

A Sea Serpent
A Sea Serpent

By L.B. Halstead

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A Pterodactyl
A Pterodactyl

By L.B. Halstead

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Dinosaurs
Dinosaurs

By L.B. Halstead

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Prehistoric Reptiles
Prehistoric Reptiles

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A closer look at prehistoric mammals
A closer look at prehistoric mammals

By L. B. Halstead

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Explains the coming of the age of mammals and how it reached its height three million years ago with the arrival of humans.

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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.

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