Ralph Metzner Ph.D. Books

Overtones and undercurrents

By Ralph Metzner

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Consciousness Medicine

By Francoise Bourzat

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A comprehensive guide to the safe and ethical application of expanded states of consciousness for therapists, healing practitioners, and sincere explorers Psychedelic medicines also known as enthe...

Healing with Entactogens

By Ralph Metzner Ph.D., Torsten Passie M.D.

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Sacred Vine of Spirits

By Ralph Metzner

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"A compilation of writings on the chemical, biological, psychological, and experiential dimensions of Ayahuasca"--Provided by publisher.

Green Psychology

By Ralph Metzner

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Sacred Mushroom of Visions Teonanacatl

By Ralph Metzner

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Searching for the Philosophers Stone

By Ralph Metzner

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The ayahuasca experience

By Ralph Metzner

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"An exploration of the chemical, biological, psychological, and experiential dimensions of ayahuasca"--

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.