- of
Pennsylvania Press. ISBN 978-1-5128-1854-3. Schandelmeier, Heinz;
Thorweihe, Ulf (14
December 2017).
Geoscientific Research in
Northeast Africa. CRC...
-
Generalized geology and hydrogeology". ne.water.usgs.gov.
Retrieved 2015-12-16.
Thorweihe, Ulf (1998). "Groundwater
Resources of the
Nubian Aquifer System". Sahara...
-
Khalil 1969, p. 558. Almond,
Ahmed &
Khalil 1969, p. 559.
Klitzsch &
Thorweihe 1999, p. 129. Lötter et al. 2022, p. 3. Almond,
Ahmed &
Khalil 1969, p...
