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'Analysis of agricultural yield. Part IV - water-table movements on a farm in Egypt'

By Balls in collaboration with M.A. Zaghloul. Received 25 Aug. 1931. Read 25 Feb. 1932. From 'Philosophical Transactions of the Royal Society of London' B. 221, 335-375 (1 plate). 2 additional graphs, dated 1950 and 1951, pasted onto p357.

Enclosed: Typescript letter to Balls, dated 14 October 1951, from the Chief Botanist at the Ministry of Agriculture, Egypt, sending readings from Roda and Pit III for June-September. 1p.

Typescript letter to Balls, dated 14 October 1952, from the Chief Botanist at the Ministry of Agriculture, Egypt, sending readings from Roda and Pit III for June-October, with a diagram of the readings. 1p.

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