Richö
Richö (Wyl. ri chos) — literally ‘Mountain Dharma’. A famous text written by Kyabjé Dudjom Rinpoche on how to take to heart and practise the ‘Mountain Retreat’ teachings. Sogyal Rinpoche says that this text is one of the most important guides on how to do retreat and become a true chöpa, or Dharma practitioner.
There are other Richö manuals written by masters such as Karma Chakmé, for example.