Columbia subject headings:
Plamenatz, J. P. (John Petrov)
Plamenatz, J. P. (John Petrov)--Bibliography.
Political science.
Harvard subject headings:
Plamenatz, J. P. (John Petrov)
Plamenatz, J. P. (John Petrov)--Bibliography.
Political science.
Princeton subject headings:
Plamenatz, J. P. (John Petrov)
Plamenatz, J. P. (John Petrov)--Bibliography.
Political science.