https://www.thespruce.com/environmentalists-you-should-know-1709040
http://www.pbs.org/wgbh/americanexperience/features/timeline/earthdays/1/
http://environmentalhistory.org/
https://blackmattersus.com/30422-garrett-augustus-morgan-was-born-today-140-years-ago/?utm_source=service_worker&utm_medium=push&utm_campaign=push20160408
http://nationalhumanitiescenter.org/tserve/freedom/1609-1865/essays/africa.htm
https://www.scribd.com/presentation/243143261/Atlantic-Slave-Trade
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