Études sur la flore des districts des Bangala et de l'Ubangi (Congo belge) : Plantae Thonnerianae Congolenses, série II / par É. de Wildeman ; introduction par Fr. Thonner
Each plate is accompanied by leaf with descriptive letterpress. Companion volume to the 1900 original, published by Oscar Schepens. Errata on last leaf. Includes index.