This work writen in French describes the Dutch zoological and hydrographic expedition to Indonesia from March 1899 to February 1900 which was headed by Max Carl Wilhelm Weber. During the expedition, Weber, has found manganese nodules on one spot between the islands of Letti and Timor, at a depth of 1224 metres, in a mud containing a strong proportion of terrigenous material, far from being a pelagic deposit as was expected by the preceeding results from J. Murray and others.

From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.

Supplement to: Weber, Max Carl Wilhelm (1902): Siboga-Expeditie, Introduction et Description de l'Expédition (1899-1900) = Siboga Expedition. Introduction and description of the expedition (1899-1900). Uitkomsten op zoologisch, botanisch, oceanografisch en geologisch gebied verzameld in Nederlandsch Oost-Indië 1899-1900 aan boord H. M. Siboga; E.J. Brill, Leiden, 1, 176 pp