Your search for "mantra" revealed the following:

Prem Naam Hai Mera: Prem Chopra

Sivananda Day-to-Day

Susruta Samhita of Maharsi Susruta (Translation of Text and Nibandha Sangraha Commentary of Sridalhana)

112 Upanisads (In Two Volumes)

Siva Darsan

Thirteen Principal Upanisads- Prasna and Mundaka Upanisads with Sankara Bhasya (An Old and Rare Book)

The Brahmayamala Tantra or Picumata (The Religious Observances and Sexual Ritual of the Tantric Practitioner: Chapter 3, 21 and 45)

Prakash: Spiritual Enlightenment (Mahamati Prannath)

The Transcendental Non-Dualism of Trika Saivism

More Teaching Stories

Finding Radha - The Quest for Love

Buddhist Divinities

समता: Samata (An Exposition of Similarities in Lalita Sahasranama With Soundaryalaharee, Saptashatee, Visnu Sahasranama and Shreemad Bhagvad Geeta) (Sanskrit Text with Transliteration and English Translation)

The Chandogyopanisad (A Treatise on Vedanta Philosophy with Commentary of Sankara (Shankaracharya))

Gurbani Selections (Set of 2 Volumes)

The Secret of Inner Voice (How God Spoke with Ancient Rishis!)

Brahmavidya: The Adyar Library Bulletin (The Theosophical Society Centenary: 1875-1975)

Bihar School of Yoga (The Vision of a Sage)

Siddhi (Attainment of the Absolute)

A Concise Encylopaedia of Hinduism- Volume 4 (Suppliment A-Z)