Correspondence between Gandhiji and Gulzarilal Nanda
Gandhiji to GLN - personal - Letter 1
Gandhiji to GLN - personal Letter 2
Gandhiji to GLN - work - Letter 1
Gandhiji to GLN - work - Letter 2
Gandhiji to GLN - work - Letter 3
GLN to Gandhiji and replies - transcript in Gujarati
GLN to Gandhiji - transcript in English
Between millowners-Gandhiji-GLN including millowner
complaining to Gandhiji about GLN inciting millworkers about compensation.
Sources of the above include:
The Sabarmati Ashram library in Ahmedabad
The Gulzarilal Nanda Museum in Kurukshetra
I have visited both myself.