Regarding your question about the other mantras you have been given...

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"Regarding your question about the other mantras you have been given"

1969 Correspondence

I think you should simply chant Hare Krishna regularly and follow the regulative principles. You must complete sixteen rounds at least. Follow the restrictive principles and avoid the ten kinds of offenses. Then everything will be clear gradually.

Letter to Vrndavanesvari -- New Vrindaban 25 May, 1969:

Regarding your question about the other mantras you have been given, I think you should simply chant Hare Krishna regularly and follow the regulative principles. You must complete sixteen rounds at least. Follow the restrictive principles and avoid the ten kinds of offenses. Then everything will be clear gradually. I hope this will meet you in very good health.