On the outside of the file Joseph Needham notes that the 'New Effort' was begun by WL [Wang Ling]/HPY [Ho Peng-Yoke]. However, it is clear that Wang Ling had less of an input into the volume during this time. Much of the correspondence is with Ho Peng-Yoke, who was responsible for completing a complete draft of the gunpowder volume in the late 1978.