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- catalog contributor b7134451.
- catalog created "1950.".
- catalog date "1950".
- catalog date "1950.".
- catalog dateCopyrighted "1950.".
- catalog description "Bibliography: leaves 575-617.".
- catalog description "Thesis - University of Chicago.".
- catalog extent "viii, 617 l.".
- catalog issued "1950".
- catalog issued "1950.".
- catalog language "eng".
- catalog publisher "Chicago,".
- catalog spatial "United States".
- catalog spatial "United States.".
- catalog subject "Inventions United States Statistics.".
- catalog subject "Inventions United States.".
- catalog title "Trends of invention in material culture: a statistical study of the classwise distribution of inventive effort in the United States as determined by patents granted during the period 1916-1945.".
- catalog type "text".