The related correspondence includes typed comments by Leeming on Nathan Sivin's criticism of his work; letter from Leeming to Kenneth Robinson, written to accompany a corrected typescript; copies of 3 letters from Loewe to Robinson and Ho Peng-Yoke, commenting on the treatment of the section on 'Geographical Factors'; copies of 2 letters from Robinson to Leeming, commenting on his contribution; copies of 3 letters from Robinson to Loewe, commenting on Leeming's contribution; copies of 2 letters letters from Ho to Loewe, about the contribution; copies of 2 letters from Loewe to Leeming, about his work.