1.
Meteorological measurements in the upper air at station Bruxelles, 1920-01-02 to 1920-06-08, ERA-CLIM ID 5651
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3.
Meteorological measurements in the upper air at station Breedene, 1915-06-28 to 1917-05-24, ERA-CLIM ID 4983
Meteorological measurements in the upper air at station Breedene, 1915-07-09 to 1917-05-25, ERA-CLIM ID 4984
Meteorological measurements in the upper air at station St. Michel, 1917-09-30 to 1918-09-28, ERA-CLIM ID 4985