Levitus, S., 1988: Decadal and pentadal distributions of hydrographic stations at 1000m depth for the World Ocean. Progress in Oceanography, 20, 83-101.

Abstract: Global distributions of hydrographic stations at 1000m depth in the world ocean are presented by decades for the period 1900-1949 and pentads for the period 1950-1974. Distributions for individual years 1965-1967 are also presented. The distributions indicate regions that may contain enough data to be suitable for studies of interpentadal and interdecadal variability.