I recommend Postal Cancellations of the Ottoman Empire by John H. Coles & Howard E. Walker in four volumes. These were first published from 1984 to 1995. I find these very useful.
I've also seen some of the early volumes of Illustrated Ottoman-Turkish Postmarks by Ziya Agaogullari and Bulent Papuccuoglu which look every impressive but I've not had a chance to look at them closely. They are published by Isfila and cover the postmarks alpabetically in ten volumes with the last one published in 2010.
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