Collections from Ceram, Indonesia:

 
Collection to De Jong, H. (1923). Studien über Eruptiv- und Mischgesteine des Kaibobo-Gebietes (West Ceram). (Niederläandisch Ostindien). Dissertation Rijksuniversiteit Utrecht, 88p. In: Rutten, L. and Hotz, W. Geological, petrographical and Palaeontological Results of Explorations, carried out from September 1917 till June 1919 in the Island of Ceram. First Series: Petrography. No. 1. A copy of the thesis is with the collection (with annotations of sample numbers).
 
Petrographic collection of magmatic and volcanic rock samples and thin sections.
 
With the material deposited there are documents "Zur Slg. W. Hotz 1918 - 1919", including
 
Standort