Jay H. Lehr Books

Domestic Water Treatment
Domestic Water Treatment

By J.H. Lehr

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Modern Groundwater Exploration
Modern Groundwater Exploration

By Robert A. Bisson, Jay H. Lehr

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"Fresh water is undoubtedly our most precious resource aside from the air we breathe, and the only commodity whose cost has steadily risen over time. At the same time, our understanding of the orig...

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Water Encyclopedia Five Volume Set
Water Encyclopedia Five Volume Set

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Environmental Instrumentation E Bk
Environmental Instrumentation E Bk

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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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