So, How Much of the Earth’s Surface Is Covered by Rain Gauges? Bull

Kidd, C., A. Becker, G. J. Huffman, C. L. Muller, P. Joe, G. S. Jackson, and D. B. Kirschbaum (2017), So, How Much of the Earth’s Surface Is Covered by Rain Gauges? Bull, Amer. Meteor. Soc., 98, 69-78, doi:10.1175/BAMS-D-14-00283.1.
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Mission: 
Global Precipitation Measurement