1. Official and tentative methods of analysis,1945
2. Limites unilaterais e bilaterais na a-nálise estatística;BRIEGER F. G.;Bragantia
3. Comunicação particular;CATANI R. A.,1953
4. A method for the determination of the relative availability of nitrogen in nitrogenous fertilizers;HAMENCE J. H.;Jour. Sci. Food and Agric.
5. The water culture method for growing plants without soil;HOAGLAND D. R.,1939