Writing down a mantra or a nama instead of chanting it is called likhita japa. Namatraya astra mantra is very effective if you perform likhita japa instead of oral or mental chanting. People fill out books doing likhita japa and keep them at home as an armor.
Primarily - Isha Upanishad and Brihadaranyaka Upanishad. There are a few more lesser known Upanishads - Jabala Upanishad, Hamsa Upanishad, Subala Upanishad, Mantrika Upanishad, Trisikhi-Brahmana Upanishad, Mandala-Brahmana Upanishad, Turiyatita-Avadhuta Upanishad, Satyayani Upanishad.
A Description Of The Sarpa Yajna
A brief description of the Sarpa Yajna conducted by Janamejaya in which billions of serpents perished....
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Gokulanayaka Ashtakam
nandagopabhoopavamshabhooshanam vibhooshanam bhoomibhootibhuri- bhaagyabhaajanam bhayaapaham. dhenudharmarakshanaava- teernapoornavigraham neelavaariv....
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