Acid soils of India : their extent and spatial variability /

by Maji, A. K., Obi Reddy, G. P., Sarkar, D. (Dipak)
Nagpur : National Bureau of Soil Survey and Land Use Planning, Indian Council of Agricultural Research, 2012

Soil survey laboratory data and descriptions for some soils of Puerto Rico and the Virgin Islands /

[Washington, D.C.] : Soil Conservation Service, U.S. Dept. of Agriculture, 1967