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Academic Publishers 1982 2nd ed., rev. and largely re-written / by R.N. Chopra ... [et al.]
Available at 1 libraries
R.N. Chopra, I.C. Chopra, B.S. Varma
Publications & Information Directorate, Council of Scientific & Industrial Research c1969
Available at 3 libraries
by R.N. Chopra, S.L. Nayar, I.C. Chopra
Council of Scientific & Industrial Research 1956
Available at 10 libraries
by R.N. Chopra
Art Press 1933
Available at 2 libraries
by R.N. Chopra and Asa C. Chandler
The Williams & Wilkins Co. 1928
Available at 4 libraries
