There 10 prints in each of the five Portfolios series. Since there were 124 plates in David Roberts's original "Egypt and Nubia" I would have thought it possible for the American University in Cairo Press to have selected 50 different prints for their Portfolio series. But alas not so. I purchased two - "The Egypt Portfolio" and "The Luxor Portfolio" only to find 3 duplications. Fair enough, I suppose, for the "Egypt" portfolio to have a pot-pourri of prints - 2 of the Sphinx (and pyramids), 3 of Luxor, 2 of Abu Simbel, and 1 each of Karnak, Edfu and Philae - but was it really necessary to include the same three of the Temple of Luxor as in "The Luxor Portfolio"?
I hesitate to purchase "The Nile Portfolio" lest I end up with more duplications of the same prints as in "The Egypt Portfolio" and "The Luxor Portfolio".
The other two in the series are "The Pyramids Portfolio" and "The Cairo Portfolio".