Your search for "mantra" revealed the following:

The Concept of Santi (In The Vedic Tradition)

Science of Sri Cakra (with 1 MP3 CDs)

AGNI PURANA (Two Volumes)

Gayatri Sadhana- The Truth and Distortions

Maha Naaraayanopanishad (Life as Sacrifice)

Sri Hari-bhakti-vilasa (Volume One): Vilasas 1-5 ((With Transliteration and English Translation))

Exploring The Mystery of Veda

Saundarya Lahari- Wave of Beauty

Modern English Translation of The Rig Veda Samhitaa (Volume III)

श्रीललितासहस्त्रनामस्तोत्रम् - The Lalita Sahasranama Stotram with English Translation and Annotations (An old and Rare Book)

Worship of Nine Planets Shri Navagraha Poojan Vidhan (Shri Navgraha Pooja Padhati) (Sanskrit, Roman with Simple Hindi-English Meaning)

Mathematics of Tantra

SRI NARADA PANCARATRA: 2 Volumes (Translation & Transliteration) (An Old and Rare Book)

Gopala - Tapani Upanishad (Commentary by Srila Visvanatha Cakravarti Thakura & Srila Baladeva Vidyabhusana)

Sri Hari-bhakti-vilasa (Volume V) (Vilasas 17-20)

Upanayana Sandhyavandana and Gayatrimantrajapa

Bhaktamar Stotra: The Song of Salvation

Damara Tantra

Yoga Psychology (A Practical Guide to Meditation)

Yajur Veda Taittiriya Samhita: (In 4 Volumes) (Complete Text in Devanagari With Transliteration, English Translation and Notes)