These books are at least 100 years old – mostly English translations of Sri Adishankara’s work on Gita, Upanishad etc with others. I saw one book from 1887!!! Thanks to Prof Sridhar for sending me this…
Isha/Kena/Mundaka Upanishads
Shiva Advaita
Dharma Sastra – Manu
Bagavad Gita
