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- Caballero, Fernán. Papers
- Campbell, Gladys. Papers
- Campbell, Mrs. Patrick. Letters
- Campbell, Wilbur and Valarie. Collection
- Campbell, William Henry, Correspondence
- Cappon, Alexander Patterson. Papers
- Carl Van Vechten. Photograph Collection
- Carlson, Anton Julius. Papers
- Carnegie Council On Children. Records
- Carpenter, Frederick Ives. Papers
- Carroll, Paul D. Papers
- Carter, Henry Kendall. Papers
- Castle, Henry Northrup.Papers
- Central Pacific Railway Company. Blueprints
- Century of Progress International Exposition Press Releases
- Century of Progress International Exposition Publications
- Century of Progress International Exposition Scrapbook
- Chalmers, Charles H. The Helicopter
- Chandrasekhar, Subrahmanyan. Papers
- Chanute, Octave. Balloons in the Recent War
- Chanute, Octave. Clippings on Aeronautics
- Chanute, Octave. Collected Papers on Civil Engineering and Aeronautics
- Charles R. Walgreen Foundation. Records
- Checklist of the Official Publications of the Century of Progress International Exposition and Its Exhibitors
- Chessman, Dorothy Crowder. Papers
- Chicago Belt Railroad Company. Records.
- Chicago Citizens Commission to study the Disorders of Convention Week. Records
- Chicago Citizens Police Committee. Records
- Chicago Civil Service League. Records
- Chicago Committee of Fifteen. Records
- Chicago Drama Performances. Index
- Chicago Fire Newspaper Collection
- Chicago Foreign Language Press Survey. Records
- Chicago Heart Association. Records
- Chicago Institute, Academic and Pedagogic. Records
- Chicago Laryngological and Ontological Society. Records
- Chicago Library Club, Records
- Chicago Mechanics' Institute. Records
- Chicago Municiapl Museum. Records
- Chicago Neurological Society. Records
- Chicago Pediatric Society. Records
- Chicago Psychological Association. Records
- Chicago Repertory Group Collection of Scripts and Scrapbooks
- Chicago Review. Records
- Chicago Society of Artists. Records
- Chirurgie aus Pierre Franco, Abstract of
- Church History Documents. Collection
- Civic Disarmament Committee for Handgun Control. Records
- Clark, Charles M. Record of Cases both Surgical and Medical, Operations, Post Mortem Examinations, etc.
- Clark, E. Payson., Jr. Papers
- Clark, Solomon H. Papers
- Cleaner Air Committee of Hyde Park-Kenwood. Records
- Clippings on Social Evils in Chicago: Chiefly the Saloon
- Clippings on Vice in Chicago
- Coggeshalll, Lowell T., Papers
- Cohen, Morris Raphael. Papers
- Cohn, Bernard. Papers
- Collection of Domestic and Medical Recipes
- Collection of German Medical and Pharmaceutical Formulae
- Collection of Medical Prescriptions and Notes on Folk Medicine
- Collection of Recipes
- Colored Pathologic Drawings
- Commentaries on Aristotle's Work
- Commission on Freedom of the Press. Records
- Commission on Race and Housing. Records
- Committee for Aid to German and Austrian Scholars. Records
- Committee on Science and Freedom. Records
- Committee to Frame a World Constitution. Records
- Cone, Fairfax M. Papers
- Contract, Inscribed Tablet
- Cook, Orator F. Papers
- Cookbook
- Coryell, Charles D. Papers
- Coryn, W.J., Pain
- Coulter, John Merle. Papers
- Coulter, Merle C. Papers
- Coulton, George Gordon. Papers
- Council on Anthropology and Education. Records
- Cowles, Henry C. Collection
- Crane, Ronald S. Papers
- Cremation Association of America, Proceedings of the Convention
- Crerar Library Collection of Patent Medicines
- Crerar, Adams & Co. Collection
- Crossroads International Student Center. Records
- Culbertson, William S., Papers
- Culianu, Ioan P. Papers
- Cullen, William. Practice of Physic
- Cunningham, James Vincent. Papers
- Cupani, Francisco. Hortus Catolicvs seu' illustrissimi et excellentissimi Principis Catholicae, ducis Misilmeres, comitis Uicaris, baronis Prizis
- Current Anthropology. Records
- Curtiss, John Christlieb. Papers
- Cyrus Leroy Baldridge. Records