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.
No team followed the Rams in re-integrating the NFL until the Detroit Lions signed Mel Groomes and Bob Mann in 1948. No black player was selected in the NFL draft until 1949 when George Taliaferro was selected in the 13th round; Taliaferro signed instead with the rival All-America Football Conference.