The Precious Treasury of the Basic Space of Phenomena — by Longchenpa
A part of Longchen Rabjam's famous collection - the Seven Treasuries. This book is commonly known as the Chöying Dzod.
Myriad Worlds — by Jamgon Kongtrul - The Treasury of Knowledge - Volume 1
Describes four major cosmological systems found in the Tibetan tradition - those associated with the Hinayana, Mahayana, Kalachakra and Dzogchen teachings - each more subtle and profound than the last.