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Frederick_Douglass:_Diễn_văn_Tưởng_niệm_Abraham_LincolnThực đơn
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Frederick Douglass Frederick, Thân vương xứ Wales Frederico Chaves Guedes Frederik X của Đan Mạch Frederick Sanger Frederik IX của Đan Mạch Frederick Soddy Frederick Douglass: Diễn văn Tưởng niệm Abraham Lincoln Frederick Griffith Frederick W. SmithTài liệu tham khảo
WikiPedia: Frederick_Douglass:_Diễn_văn_Tưởng_niệm_Abraham_Lincoln http://archives.nbclearn.com/portal/site/k-12/flat... http://www.theliberatorfiles.com/category/douglass... http://www.lourdes.edu/portals/0/files/academics/a... http://onlinebooks.library.upenn.edu/webbin/book/l... http://www.pbs.org/wgbh/aia/part4/4h2927t.html http://teachingamericanhistory.org/library/documen... https://www.youtube.com/watch?v=ALXPUYWFbGI https://archive.org/details/frederickdouglas0000mc... https://archive.org/details/frederickdouglas00mill https://web.archive.org/web/20120805014608/http://...