Theory of electrical filters

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subjects: Electric filters,  Electric networks,  Institute of Pacific Relations,  Presbyterian Church,  Christianity,  Social problems,  Correspondence,  United China Relief (U.S.),  China Institute in America,  Yale-in-China Association,  Civil rights,  Cultural policy,  Politics and government,  United Service to China,  Journalism,  United Presbyterian Church in the U.S.A.,  National Urban League,  Council on Foreign Relations,  Ecology,  Endowments,  United Presbyterian Church in the U.S.A. Fifty Million Fund,  Rockefeller Brothers Fund,  National Presbyterian Church (Washington, D.C.),  Yale Law School,  Social history,  Social conditions,  United Board for Christian Higher Education in Asia,  Education,  International law