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.
Jack Roosevelt Robinson or Jackie Robinson as he is known was the first black person who was allowed to play in the Major League Baseball. This happened in 1947 when he debuted with the Brooklyn Dodgers as one of their players. Before that, a black person was only allowed to play in the Negroes Leagues.