He maintained several notebooks. Some were strictly for his personal calculations and experiments with breath (Pranayama) and the chakras. Others contained his translations and interpretations of classical texts like the Bhagavad Gita, the Yoga Sutras of Patanjali, and the Upanishads.
: This biography by Dr. Ashoke Kumar Chatterjee is widely regarded as the most authentic source, as it was written using the 26 original diaries entrusted to him by Lahiri Mahasaya's grandson, Satyacharan Lahiri. You can often find excerpts or digital versions of this work on platforms like Scribd . lahiri mahasaya diary pdf download
: Direct, handwritten accounts of his internal states during Kriya practice. He maintained several notebooks