ICOADS Web information page (Tuesday, 07-Jan-2014 23:57:47 UTC):

Figure 1

Figure 1. Original NCDC 1° landmask (LNDLMT): black for land areas, green for ocean.

[Links to detailed][Landmask files]

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Updated: Jan 7, 2014 23:57:47 UTC
http://icoads.noaa.gov/mask_fig1.html