1. Observations of coffee ini Kenya: Pt. I, Chlorosis and die-back in coffee;Beckley V. A.;Empire Jour. Exp. Agric.,1935
2. Sôbre as substâncias minerais do cafeeiro: B. Relação de peso das partes singulares do cafeeiro;Dafert F. W.;Relatório Secret. Agric. Com. Obr. Publ. São Paulo,1917
3. Studies of the root system of Coffea arabica L: I. Environment conditions affecting the distribution of coffee roots in Coloso clay;Guiscafré-Arrilaga J.;Jour. Agric. Univ. Puerto Rico,1938
4. Studies of the root sistem of Coffea arabica L: III. Growth and distribution in Catalina clay soil;Guiscafré-Arrilaga J.;Jour. Dept. Agric. Puerte Rico,1940
5. Studies of the root system of Coffea arabica L: III. Growth and 'distribution of roots of 21-old trees in Catalina clay soil;Guiscafré-Arrilaga J.;Jour. Agric. Univ. Puerto Rico,1942