Teachings of Tibetan Yoga — translated by Garma C.C. Chang

This is one of those rare books that goes into how to practice the inner yogas, including tummo and the other yogas of Naropa.

The Jewel Treasury of Advice - A Hundred Teachings From the Heart - The Wisdom of Drikung Bhande Dharmaradza

The author maps out, in verse, the entire structure of the Buddhist path according to both sutra and tantra.

A Waterdrop from the Glorious Sea - A concise account of the advent of Buddhism in general and the teachings of the Sakyapa tradition in particular — compiled by Sherab Gyaltsen

Ornament of Stainless Light - An Exposition of the Kalacakra Tantra — by Khedrup Norsang Gyatso (Library of Tibetan Classic - volume 14)

The Kalacakra texts present an amazingly detailed theory of cosmology and astronomy, especially about the movements of the various celestial bodies.

A Gem of Many Colors - The Autobiography of Jamgon Kongtrul

A rich source of information on the religion, culture, and politics of Tibet during his times.

The Teacher-Student Relationship — by Jamgon Kongtrul Lodro Taye

This essential text clearly lays out what credentials and qualities one should look for in a wisdom teacher, why a wisdom teacher is necessary, and how the relationship between this teacher and disciple best develops once it is established.

The Wheel of Sharp Weapons - A Mahayana Training of the Mind — by Dharmaraksita

With Commentary by Geshe Ngawang Dhargyey

Opening the Treasure of the Profound - Teachings on the Songs of Jigten Sumgon and Milarepa — by Konchog Gyaltshen

Translation of songs composed by iconic Buddhist figures in Tibet and explanation of their profound meaning.

Clarifying the Natural State - A Principal Guidance Manual for Mahamudra — by Dakpo Tashi Namgyal

A Buddhist Classic. Presenting the profound and ultimate instructions of Mahamudra, it embodies the realization of India and Tibet's greatest masters.

Dusum Khyenpa's Songs and Teachings - A Variety of Songs and Teachings from the First Karmapa's Collected Works  by Tony Duff