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Chopra, R.N. and I.C. Chopra (1965) Drug addiction with special reference to India. [Publication]
Chopra, R.N. and I.C. Chopra (1955) Quasi-medical use of opium in India and its effects. [Publication]
Chopra, R.N. and I.C. Chopra (1955) A review of work on Indian medicinal plants. [Publication]