Pérez Tirado, A.J. et al. 2026. COMPARISON OF THE DENSITY OF SANDY SOIL BY ADDING PINE SEED ASH (3%, 6% AND 9%), BY PROCTOR TEST. LACCEI. 1, 14 (July 2026). DOI:https://doi.org/10.18687/LACCEI2026.1.1.2136.