Figure 8, Lava-Cooling Operations during the 1973 Eruption of Eldfell Volcano, Heimaey, Vestmannaeyjar, Iceland, U.S. Geological Suvery Open-File Report 97-724, by Richard S. Williams, Jr., Editor

Lava-Cooling Operations During the 1973 Eruption of Eldfell Volcano,
Heimaey, Vestmannaeyjar, Iceland
U.S. Geological Survey Open-File Report 97-724

a-	6 February; the Vestmannaeyjar fire department starts spraying [water on] the lava.
b-	Amount of pumping equipment tis increased.
c-	Amount of pumping equipment is increased.
d-	The dredge Sandey begins operation.