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As compared to a wild type Italian ryegrass biotype , the GR50 values for diclofop , haloxyfop , and sethoxydim were approximately 130 - , 22 - , and 2-fold greater , respectively , for the resistant biotype . In spite of more competition - - the number of colleges in the state had risen from three to 22 - - the enrollment was nearly 200 ; the number of buildings had reached nine ; and the campus bore at least general resemblance to that of today . It was at the core of Katherine Dunham 's technique and a chief component of Talley Beatty 's brilliance and the promise of another young choreographer , who garnered tremendous attention when he emerged on the modern dance scene near the end of the 1950s - - Alvin Ailey . Collectors have worked this area since the early 1950s - - while there are still good pieces to be found , you have to work harder to find them . The Hamas-led government in Gaza and the West Bank is unable to pay salaries to its 150,000 - plus workers , and border closings have significantly curtailed critical export revenues and imports of food and other goods . Damming capacity was increased by 2.6 billion cubic meters and the irrigated surface surpassed the 44,700 - caballeria mark to more than 63,300 in 1980 . American artist Ben Shahn ( 1906 – 1969 ) , best known for his social content paintings and his politically progressive graphic work , also created an impressive body of documentary photographs in the 1930s .