ancillary data are often very diverse, may include maps, vegetation phenologies, and many kinds of information about human activities in the general area. human experts bring all these element s, plus their acquired skills and knowledge of related disciplines ...
Fritz Pollard and Bobby Marshall were the first black players in what is now the NFL in 1920. Pollard became the first (and until 1989, only) black coach in 1921; during the early-to-mid-1920s, the league used player-coaches and did not have separate coaching staffs.
African Americans make up nearly 65 percent of NFL rosters. The league began in 1920. Yet only a handful of black players have kicked for a living: Horace Gillom, Greg Coleman, Reggie Roby, Donald Igwebuike, Rodney Williams, Danny Knight, Cedric Ogelsby, and Justin Medlock. To put it in perspective, Augusta National now has more women members than the NFL has black kickers.