Philip Geer Books

Essential Words for the GRE
Essential Words for the GRE

By Philip Geer

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Picture These SAT Words in a Flash
Picture These SAT Words in a Flash

By Philip Geer

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This set of vocabulary-building flash cards present cartoon illustrations showing visual puns with sample sentences and verbal mnemonics with definitions given on the reverse side of each card. Wo...

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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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