516 710 a july 1950 mascolo 2 715 486 a august 1955 marcoff moghadam et al 2 890 519 a june 1959 storz jr 3 249 104 a may 1966 hohnstein 3 274 658 a september 1966 pile 3 452 742 a july 1969 muller 3 506 012 a april 1970 brown 3 509 882 a may 1970 blake 3 547 103 a december 1970 cook 3 570 497 a march 1971 lemole 3 608 095 a september 1971 barry 3 620 212 november 1971 fannon et al 3 638 654 a february 1972 akuba re27 391 e june 1972 merser 3 753 438 a august 1973 wood et al 3 786 806 january 1974 johnson et al 3 875 648 a april 1975 bone 3 890 977 june 1975 wilson 3 910 281 a october 1975 kletschka et al 3 958 576 a may 1976 komiya 4 038 725 a august 1977 keefe 4 103 690 a august 1978 harris 4 140 125 a february 1979 smith 4 170 990 a october 1979 baumgart et al 4 192 315 a march 1980 hilzinger et al 4 217 902 a august 1980 march 4 324 248 a april 1982 perlin 4 345 601 a august 1982 fukuda 4 416 266 a november 1983 baucom 4 456 017 a june 1984 miles 4 485 816 a december 1984 krumme 4 522 207 a june 1985 klieman et al 4 535 764 a august 1985 ebert 4 549 545 a october.