The Schomburg Papers - This collection consists of correspondence, published and unpublished writings and other articles that reflect his activities as researcher and writer, collector and curator. - http://digilib.nypl.org/dynaweb/ead/nypl/scmgaasp/@Generic__BookView
The Negro Digs up His Past - Full text with images of Schomburg's essay published in the March 1925 issue of "The Survey Graphic". - http://etext.lib.virginia.edu/harlem/SchNegrF.html