era are generally limited to military activities. References Fred Wendorf and Romuald Schild, 2000. Late Neolithic megalithic structures at Nabta Playa (Sahara), southwestern Egypt. University College London, 2001. Trade/Foreign relations in the Badarian period. Barbara G. Aston, James A. Harrell, Ian Shaw (2000). Paul T. Nicholson and Ian Shaw editors. "Stone," in Ancient Egyptian Materials and Technology, Cambridge, 5-77, pp. 46–47. Also note: Barbara G. Aston (1994). "Ancient Egyptian Stone Vessels," Studien zur Archäologie und Geschichte Altägyptens 5, Heidelberg, pp. 23–26. (See on-line posts: and .) Branislav Andelkovic, 1995. The Relations between Early Bronze Age I Canaanites and Upper Egyptians, Belgrade, p. 58, map 2. Branislav Andelkovic, 2002. Southern Canaan as an Egyptian Protodynastic Colony. Cahiers Caribéens d`Egyptologie 3-4: 75-92. Branislav Andelkovic, 1995, pp. 68-69, map 1; Branislav Andelkovic 2002. Places where cylinder seals similar to that from Naqada tomb 1863 have been found. Dominique Collon, 1987. First Impressions, Cylinder Seals in the Ancient Near East, London, pp. 13-14. University College London, 2000. Maadi: Predynastic culture of Lower Egypt, about 4000 - 3500 (contemporary with Naqada I - IIb). Foreign Relations in Pre- and Early Dynastic Egypt. Peter Warren, 1969 and 1995. Minoan Stone Vases (1969), Cambridge, pp. 108-109. Minoan Crete and Pharaonic Egypt: in Egypt, the Aegean and the Levant. Interconnections in the Second Millennium BC (1995), edited by W. Vivian Davies and Louise Schofield, London, pp. 1-18. Naomi Porat, "Local Industry of Egyptian Pottery in Southern Palestine During the Early Bronze I Period," in Bulletin of the Egyptological, Seminar 8 (1986/1987), pp. 109–129. See also University College London web post, 2000. Ibidem, previous reference above. Naomi Porat and Edwin van den Brink (editor), "An Egyptian Colony in Southern Palestine During the Late Predynastic to Early Dynastic," in The Nile Delta in Transition: 4th to 3rd Millennium BC (1992), pp. 433–440. Ibid. Wolfgang Helck, 1987. Untersuchungen zur Thinitenzeit, in Ägyptologische Abhandlungen, 45. Wiesbaden, p. 132. H. S. Smith, 1992. The Making of Egypt: A Review of the Influence of Susa and Sumer on Upper Egypt and Lower Nubia in the 4th Millennium B.C., in The Followers of Horus: Studies dedicated to Michael Allen Hoffman, 1944-1990, edited by Renee Friedman and Barbara Adams, Oxford. William Stevenson Smith, 1965. Interconnections in the Ancient Near East, New Haven/London. Jobbins, Jenny. "The 40 days' nightmare," in Al-Ahram, 13–19 November 2003, Issue No. 664. Published in Cairo, Egypt. Buhen, some finds from the Middle