Dissertations 13 Dissertations, Academic Computer-assisted instruction 3 English language 3 Study and teaching 3 University of Pennsylvania 3 Composition and exercises 2 Data processing 2 Rhetoric 2 Social aspects 2 Addresses, essays and lectures 1 Antiguities 1 Antiguities, Prehistoric 1 Attitude (Psychology) 1 Attitudes 1 Business cycles 1 Children 1 College students 1 Discussion 1 Econometric models 1 Economic conditioris 1 Foreign speakers 1 History and criticism 1 Hokkien dialects 1 Infants 1 Informal sector (Economics) 1 International economic relations 1 Language and languages 1 Mathematical models 1 Monetary policy models 1