On 14 March 1974, His Divine Grace A.C. Bhaktivedanta Swami Prabhupada wrote the following important letter to all ISKCON centres.
In co-operation with the ISKCON GBC, the Bhaktivedanta Book Trust is commemorating 14 March as ‘BBT Only Day’. This year (2015) marks the 41st anniversary of this letter, and it is important that every ISKCON devotee be familiar with and understand the importance of this letter.