by Leffingwell, R. C.
Published in The American economic review (01.03.1921)

by Leffingwell, R. C.
Published in Proceedings of the Academy of Political Science in the City of New York (01.07.1921)

by Leffingwell, R. C.
Published in Proceedings of the Academy of Political Science in the City of New York (01.06.1920)

by Leffingwell, R. C.
Published in Foreign affairs (New York, N.Y.) (01.01.1950)

by Leffingwell, R. C.
Published in The Annals of the American Academy of Political and Social Science (01.07.1922)

by Leffingwell, R C
Published in Barron's national business and financial weekly (13.11.1950)

by R. C. Leffingwell
Published in Foreign Affairs (01.01.1950)

by Leffingwell, R C
Published in Foreign affairs (New York, N.Y.) (01.01.1949)