Soils, their formation, properties, composition, and relations to climate and plant growth in the humid and arid regionsNote 155 — Chapter XXI · SOILS OF ARID AND HUMID REGIONS (Continued).Reading editionAnnales de la Science Agronomique, tome 1er, 1901, fasicules 1, 2, 3.◇Copy noteReturn to CHAPTER XXI. SOILS OF ARID AND HUMID REGIONS (Continued).