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keyword: humic acid – 8 free books.
These books are not included in Project Gutenberg.
Amin Beiranvand Pour et al. (editors)
Carbon and Nutrient Transfer via Above and Belowground Litter in Forests
Fuzhong Wu et al. (editors)
Smart Fertilizers and Innovative Organic Amendments for Sustainable Agricultural Systems
Maria de la Luz Mora et al. (editors)
Toward a Sustainable Agriculture Through Plant Biostimulants
Youssef Rouphael and Giuseppe Colla, editors
Physiological and Molecular Characterization of Crop Resistance to Abiotic Stresses
Monica Boscaiu and Ana Fita, editors
Nanomaterials for Environmental Purification and Energy Conversion
Ewa Kowalska et al.