TY  - BOOK
AU  - Tiessen,H.
AU  - Salcedo,I.H.
AU  - Sampaio,E.V.S.B.
TI  - Nutrient and soil organic matter dynamics under shifting cultivation in semi-arid northeastern
UR  - https://drive.google.com/file/d/1SM6FkNSWdKz9RFmLGCJo9m8Oesec8Cyc/view?usp=drivesdk
ER  -