What are farmers really planting? Measuring the presence and effectiveness of Bt cotton in Pakistan. by David J Spielman, Fatima Zaidi, Patricia Zambrano, Asif Ali Khan, Shaukat Ali, H Masooma Naseer Cheema, Hina Nazli, Rao Sohail Ahmad Khan, Arshad Iqbal, Muhammad Amir Zia, Ghulam Muhammad Ali

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