David Katz wrote:
the list of progression of World Bests but include a line below 1984 with a note: "worldwide measuring procedures and tolerances did not become standardized until after 1983"
David Katz
USA Men
2:08:52( 1) Alberto Salazar Apr 1982 Boston
2:08:54 Dick Beardsley 1982 Boston
2:09:01 Greg Meyer 1983 Boston
2:09:21 Alberto Salazar 1983 Fukoka
2:09:28 Bill Rodgers Apr 1979 Boston
2:09:29 Alberto Salazar- New York NY
2:09:32 Ron Tabb Apr 1983 Boston MA
2:09:36.2a ( 1) Dick Beardsley 1981 Duluth
2:09:56 a ( 1) Bill Rodgers 1975 Boston
2:09:58 a ( 3) Benji Durden 1983 Boston
2:10:07 a ( 4) Ed Mendoza 1983 Boston
2:10:08 ( 5) Alberto Salazar1983 Rotterdam NED
2:10:14 a ( 1) Bill Rodgers- 1978 Boston
2:10:16 a ( 2) Jeff Wells 1978 Boston
2:10:18.6a ( 1) Tony Sandoval 1980 Buffalo NY
2:10:19.9a ( 1) Garry Bjorklund 1980 Duluth MN
2:10:20 ( 1) Tony Sandoval 1979 Eugene OR
2:10:20 ( 1) Jeff Wells 1979 Eugene OR
2:10:27 a ( 2) Craig Virgin 1981 Boston
2:10:29 ( 7) Kirk Pfeffer 1980 Fukuoka
2:10:30 ( 1) Frank Shorter 1972 Fukuoka
2:10:35 a ( 3) Bill Rodgers- 1981 Boston
2:10:40.3a ( 2) Benji Durden May 1980 Buffalo NY
2:10:45.8 ( 2) Frank Shorter Jul 1976 Montreal CAN
2:10:46 a ( 3) Ron Tabb Oct 1983 New York
2:10:51 a ( 4) John Tuttle Oct 1983 New York
Not one of these americans were ever able to break 2:11 after the changing of the way they measure courses (1984). NOT ONE. The most interest part of this is that 11 sub 2:11 performances were run in 1982 and 1983 and ZERO in 1984.