Karl Knopf Books

Ab Wheel Workouts 50 Exercises To Stretch And Strengthen Your Abs Core Arms Back And Legs
Ab Wheel Workouts
Ab Wheel Workouts

By Karl Knopf

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Therapy Ball Workbook
Therapy Ball Workbook

By Karl Knopf

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Therapy Ball Workbook
Therapy Ball Workbook

By Karl Knopf

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Trigger Point Therapy with the Foam Roller
Injury Rehab with Resistance Bands
Stability workouts on the balance board
Beat osteoporosis with exercise
Beat osteoporosis with exercise

By Karl G. Knopf

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Presents an exercise program of more than one hundred low-impact exercises, with detailed fitness plans and illustrations of movements designed to increase mobility, lower risk of injury, improve b...

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Beat Osteoporosis with Exercise
Heal Your Frozen Shoulder
Heal Your Frozen Shoulder

By Karl Knopf

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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.

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