In this week’s edition of Letter and Spirit, we present a unique letter written by the Rebbe in 1968, in which he explains the concept of holiness/kedusha as it relates to the Holy Land and to other areas. In the P.S. of the letter, the Rebbe touches on the subject of increasing land productivity through artificial means, and makes some interesting comments about the safety of doing this. The letter was written in English through the Rebbe’s trusted secretary Rabbi Nissan Mindel, and was made available by the latter’s son-in-law, Rabbi Sholom Ber Shapiro.