I think it was Achieck who posted that she found it in the Heaven's Children Book, and a look at the ML list shows that #2110 - HC 12- "The Moon", and #2111 - HC 13 - "More on the Moon" are probably what I'm looking for. I don't need a quotation from these letters, just verification from someone who has them that these letters do contain Berg's teachings on heaven in the moon.
Achieck, could you, or anyone else reading this, confirm that for me. Also, could you provide the dates of publication as the ML list does do not have that for these letters. Thanks.