sentences:  From the 1950s until his death Hayit wrote dozens of articles and 15 acclaimed books in German, English, and Turkish on the history of Turkestan (the now independent republics of Turkmenistan, Kyrgyzstan, Kazakhstan, Uzbekistan and the Chinese province of Xinjiang).His major works are ""Turkestan im XX.Jahrhundert"" (1956), ""Sowjetrussische Orientpolitik am Beispiel Turkestans"" (1962), ""Die Wirtschaftsprobleme Turkestans"", (1968), ""Turkestan zwischen Russland und China"", (1971) and ""Basmatschi