Two excavations in the Euphrates frontier 1968 - 1974. Pağnik Öreni (Eastern Turkey) 1968 - 1971, and Dibsi Faraj (Northern Syria) 1972 - 1974 - Harper, R.P (Studien zu den Militärgrenzen Roms, 2. Vorträge des 10. Internationalen Limeskongresses in der Germania Inferior)