Horn, D R; Delach, M N; Horn, B M (1973): Observation of manganese deposits recovered by the R/V Robert Conrad and R/V Vema over the World Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.875101, In supplement to: Horn, DR et al. (1973): Metal content of ferromanganese deposits of the oceans. Lamont-Doherty Geological Observatory of Columbia University, Palisades, New York, Technical Report, Office for the International Decade of Ocean Exploration, National Science Foundation, Washington, D. C. 20050 (unpublished manuscript) https://www.ngdc.noaa.gov/mgg/geology/data/multiple_platforms/0199/01995002/01995002.pdf, 3 (NSF GX-33616), 78 pp (pdf 3 MB), https://store.pangaea.de/Projects/NOAA-MMS/Horn-etal_1973.pdf