na PBTAN000000000001466 20250213091531 0010-0225000107 ta 250213 g 0 eng Tripp Robert Pengarang Planned change in farming systems: progres in on-farm research / Robert Tripp x-348 halaman : Ilustrasi ; 25 cm England : John Wiley; Sons, 1991 rdacontent text rdamedia tanpa perantara rdacarrier volume 0471-93417-8 631.117.2 631.117.2 TRI p Perubahan terencana pertanian penelitian Bibliografi; halaman 336-337