From 1908 to 1910 he was a member of a scientific mission to the South Pacific that was coordinated by Georg Thilenius (1868-1937) of the Hamburg Museum of Ethnography. On the expedition he spent nine months on the island of Yap, about which an important scientific treatise was later published. He also took part in the Berlin-Indonesian expedition to the South Moluccas in 1913-14. Müller-Wismar died from typhoid on October 10, 1916 at the age of 35 in Malang, Java.
- Beiträge zur Kraniologie der Neu-Britannier, Hamburg : Kommissionsverlag von L. Gräfe & Sillem, 1906 – Contributions involving the craniology of New Britons.
- Yap, Hamburg, L. Friederichsen & Co., 1917-18; part of the series "Ergebnisse der Südsee-expedition, 1908-1910"; work also translated into English.
- "This article is based on a translation of an equivalent article at the German Wikipedia".
- Via Libri Yap- Müller (Wismar), Wilhelm - 1917. 
- OCLC Classify publications
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