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.
After Williams, no black QBs entered the league for five years. During the 1983 season, Evans was the only black quarterback in the NFL (Williams was in the USFL at the time). Evans joined Williams in the USFL after the season, but in 1984, the landscape of what a black quarterback could do in the NFL changed forever.