Osho – the Beloved
http://www.oshorajneesh.com/download/osho-books/Indian_Mystics/The_Beloved_Vol_2.pdf controversial but pre- 1977 works worth a read
book
Nisargadatta
http://holybooks.lichtenbergpress.netdna-cdn.com/wp-content/uploads/I-Am-That-by-Sri-Nisargadatta-Maharaj.pdf