The archive comprising letters, documents and photographs is expected to be auctioned for between 500000-700000 pounds.
Kallenbach (1871-1945) met Mahatma Gandhi in 1904 in South Africa, and the two since then remained in touch even after Gandhi returned to India.
Day in Pics: 17th September
Showbiz World - September 17, 2014
Aamir Khan's sensational 'PK' posters