Ralph Metzner Books

More than 50 years after Timothy Leary encouraged an entire generation to "turn on, tune in, drop out," there's been a resurgence of scientific research and popular interest in the use of psychedel...

The Psychedelic Experience

By Timothy Leary Richard Alpert Ralph Metzner

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Years after the Summer of Love, the promise of the psychoactive 1960s—that deeper self-awareness and greater harmony can be achieved through reality-bending substances and practices—is...

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.