Development of GPS-based Tracking System to Evaluate the Effectiveness of Tillage using Four-wheel Tractor by Nugroho, A P, Shalih, S M, Purwantana, B, Sutiarso, L, Radi, Markumningsih, S, Masithoh, R E, Yun, J H, Kim, K U, Yeo, I C, Lee, D G

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