Hello Dan -
there are also a few good camels coming from Sudan on the Camel Market in Cairo:
"In Search of the Forty Days Road"
Michael Asher 1984
El Fasher - Dongola by camel

A recent book about Libya,
from Ghadames to Kufra by camel with local guides:

"South from Barbary - Along the Slave Routes of the Libyan Sahara"
Justin Marozzi
Harper Collins Publishers 2001