CTTA [Communication for technology transfer in agriculture project] : a method for transferring technology to farmers -- planning and implementation guide, a handbook/manual from 1992 PN-ABP-920
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CTTA [proyecto de comunicacion para la transferencia de tecnologia en agricultura] : un metodo para transferir tecnologia a los agricultores -- una guia para planificacion e implementacion, a handbook/manual from 1992 PN-ABP-921