Articles of Agreement between Mattie Robertson and Realty Security Corporation   Publication Date:   1920-05-03 Creator:   Realty Security Corporation ( Signer ) Subjects.Display:   African American philanthropists -- Florida -- Miami -- History -- 20th century African Americans -- Florida -- Miami -- History -- 20th century Dorsey, Dana A. -- 1872-1940 Real estate developers -- Florida -- Miami -- History -- 20th century Source Institution:   Florida International University Donor:   Chapman, Dana Articles of Agreement between Mattie Robertson and Realty Security Corporation