on 31 October 2009
'Essentials of Mahamudra' is based on a text 'Moonlight of Mahamudra' written by a great scholar and meditator of the 16th century Tashi Namgyal (1512 - 1587). This volume goes well in pair with 'Mahamudra: The Moonlight - Quintessence of Mind and Meditation'. It even has references to certain pages in 'Mahamudra: The Moonlight'(Lobsang P. Lhalungpa's translation) for more in-deep explanations. It has Q&A sessions taken from four of five retreats with Khenchen Thrangu Rinpoche. These were held in California between 1990 and 1995.
Without any doubt, you can start with this one before digging any deeper.