W.E.B. Du Bois papers includes correspondence with Georgia Douglas Johnson.
Online editions of Georgia Douglas Johnson’s anthologies Heart of a Woman and Bronze can be found here.
The Modernist Journals Project provides a digital archive of The Crisis (1910-1922):
Johnson, Georgia Douglas. “Afterglow.” The Crisis Mar. 1920: 266. Print.
—. “Again It Is the Vibrant May.” The Crisis May 1918: 12. Print.
—. “A Sonnet in Memory of John Brown.” The Crisis Aug. 1922: 169. Print.
—. “A Sonnet: To the Mantled!” The Crisis May 1917: 17. Print.
—. “Attar.” The Crisis Mar. 1920: 253. Print.
—. “Calling Dreams.” The Crisis Jan. 1920: 134. Print.
—. “Desert-Bound.” The Crisis 1918: 275. Print.
—. “Essence.” The Crisis June 1916: 32. Print.
—. “Fame.” The Crisis Sept. 1916: 229. Print.
—. “Gossamer.” The Crisis June 1916: 42. Print.
—. “Guardianship.” The Crisis Oct. 1917: 293. Print.
—. “Heritage.” The Crisis Oct. 1917: 293. Print.
—. “Hope.” The Crisis Oct. 1917: 293. Print.
—. “Let Me Not Lose My Dream.” The Crisis Oct. 1917: 293. Print.
—. “Mate.” The Crisis Nov. 1916: 35. Print.
—. “Motherhood.” The Crisis Oct. 1922: 265. Print.
—. “My Boy.” The Crisis Oct. 1917: 293. Print.
—. “My Little Dreams.” The Crisis Apr. 1919: 279. Print.
—. “My Little One.” The Crisis Oct. 1916: 273. Print.
—. “Passing of the Ex-Slave.” The Crisis Sept. 1918: 226. Print.
—. “Peace.” The Crisis Sept. 1916: 218. Print.
—. “Potency.” The Crisis Apr. 1919: 200. Print.
—. “Prejudice.” The Crisis May 1919: 14. Print.
—. “Shall I Say, ‘My Son, You Are Branded’?” The Crisis Aug. 1919: 188. Print.
—. “Tears and Kisses.” The Crisis Aug. 1917: 172. Print.
—. “The Final Strain.” The Crisis Jan. 1917: 132. Print.
—. “The Hegira.” The Crisis Mar. 1917: 225. Print.
—. “The Mother.” The Crisis Oct. 1917: 293. Print.
—. “Treasure.” The Crisis July 1922: 120. Print.
—. “Why?” The Crisis Feb. 1917: 184. Print.
The Index of Modernist Little Magazines has additional information about The Crisis as well as a plethora of other magazines.