Roberts, R. C ; United States. Bureau of Chemistry and Soils ; Lopez Dominguez, F.A ; Baldwin, Mark ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; Lopez Dominguez, F.A ; Baldwin, Mark ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; University of Puerto Rico. Agricultural Experiment Station ; Lopez Dominguez, F.A ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc ; Baldwin, Mark
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; University of Puerto Rico. Agricultural Experiment Station ; Lopez Dominguez, F.A ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc ; Baldwin, Mark
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; University of Puerto Rico. Agricultural Experiment Station ; Lopez Dominguez, F.A ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc ; Baldwin, Mark
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; University of Puerto Rico. Agricultural Experiment Station ; Lopez Dominguez, F.A ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc ; Baldwin, Mark
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; University of Puerto Rico. Agricultural Experiment Station ; Lopez Dominguez, F.A ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc ; Baldwin, Mark
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; University of Puerto Rico. Agricultural Experiment Station ; Lopez Dominguez, F.A ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc ; Baldwin, Mark
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; University of Puerto Rico. Agricultural Experiment Station ; Lopez Dominguez, F.A ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc ; Baldwin, Mark
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942
Roberts, R. C ; United States. Bureau of Chemistry and Soils ; University of Puerto Rico. Agricultural Experiment Station ; Lopez Dominguez, F.A ; Knight, Henry G ; Kellogg, Charles E ; A. Hoen & Co. Inc ; Baldwin, Mark
U.S. Dept. of Agriculture . Bureau of Chemistry and Soils 1942