During the last fifteen years of his life, he focused most of his interest on the shell rings of Sapelo Island off the Georgia coast.
Many scholars doubt the assertion that it was as far north as the Chesapeake; most place it in present-day Georgia's Sapelo Island.
It was found in 28 of 72 rice rats at Cedar Key, Florida, with the number of flukes per infected rat ranging from one to 150 (average 17), and in five of six rice rats from Sapelo Island, Georgia, with two to 51 flukes per rat (average 18), but did not occur in more than 100 rice rats from freshwater marshes in Florida.
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When Muhammed returned to Chicago in 1990, he attended the American Islamic College for two additional years and restarted his Magribine Press with an edited edition of Muhammed Alexander Rusell Webb's Islam in America (1993), an edited edition of Shaykh Daoud's al-Islam, the True Faith of Humanity (2003), and his translation of the Fiqh text called the Ben Ali Diary or the Bilali Document written by Bilali Muhammad of Sapelo Island, Georgia.
After two major slave raiding attacks in 1680, the Santa Catalina de Guale mission was moved south to Sapelo Island.