The Umbra is explored by many Night-Folk with wraiths in the Shadowlands, changelings in the Dreaming, and Werewolves in the Velvet Shadow. What about mages? Adam and Terry provide a tour of the Tellurian and the Realms of limitless potential full of warring gods, metaphors made real and more than one set of dinosaurs in Beyond the Barrier: The Book of Worlds.

• Umbral Map - A translation of the French map of the Umbra
• Mars Trilogy - Sci fi books by Kim Stanley Robinson where a central theme is "how much should we leave a place unchanged?
• Anders Mage Page Realms - Realms you can insert into the Umbra of your Chronicle.
• Anders Mage Page Umbrood - Umbrood you can use in your Chronicle.
• The Sandman comics by Vertigo - listed in Book of World's recommended reading list and Adam seconds that opinion.  You can not only get great ideas for realms large and small but also see different ways to travel between them.

Episodes Mentioned: 

• Tomes of Magick: Digital Web - Adam and Terry discussion the technomancer's favorite Zone, the Digital Web.
• Verbena Tradition Book - The Seasonal Realms are discussed as mysterious places where no one quite knows where they came.

Books Mentioned :

• The Infinite Tapestry - Revised edition guide that expands many Umbral locations
• Umbra: the Velvet Shadow - Werewolf 20 guide to the Umbra
• Wraith 20 - Core book outlining life as a Wraith
• Book of Oblivion - Wraith 20 guide to areas beyond Stygia and the Shadowlands
• Orpheus Rules - Game were you are mortals projecting into the Underworld
• Scion: Origins - Scion 2e guide to characters and introducing the pantheon and such
• The Primal Order: Pawns - Worth a look for ideas on Umbrood.
• Chessboards: The Planes of Possibility - Adam highly recommends this book for ideas on Umbral realms and how to travel between them.