Adlân zu Hellet - Idrîs am Gebel - Ghûle.'
Inderwuste des Batn - el -Hágar. [Nubien.]'
These images come from 'Reise in Nordost Africa' (Journey in North Africa) in which the Prussian Baron Adalbert was accompanied by the physician Robert Hartmann on an expedition centred around the blue Nile river in 1859-1860.
Their journey took them to Egypt, Sudan and Nubia and both Adalbert and Hartmann produced the artwork which was later rendered into these beautiful lithographs in Berlin where the book was published in 1863. There are 3 pages of thumbnail images at NYPL.
Adalbert died during the trip and search results are a little ambiguous for Hartmann - he seems to have written further anthropology papers about the peoples of Nubia. There is a 4 page 1863 journal review of 'Reise in Nordost Africa' available as a pdf from this page - but it's in german and they are page images so I couldn't copy them into a translator. There is a small amount of information at this translated page (under 'Barnim'). [I've cleaned up a fair amount of age related damage to the above images]