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The Otto Gas Engines at the Columbian Exposition - pp305 - 306
doi:10.1038/scientificamerican11111893-305
Notes from the Worlds Columbian Exposition Chicago 1893 - p307
doi:10.1038/scientificamerican11111893-307
Boring Machine for Corliss Engine Cylinders - pp308 - 309
doi:10.1038/scientificamerican11111893-308a
Mechanical Arithmetic - pp309 - 310
Dorr E. Felt
doi:10.1038/scientificamerican11111893-309b
Improved Construction of Floors, Ceilings, Arches, Etc - p312
doi:10.1038/scientificamerican11111893-312
Western Electric Company's Luminous Sign - pp312 - 313
doi:10.1038/scientificamerican11111893-312a
The World's Columbian Exposition—The Court of Honor - p313
doi:10.1038/scientificamerican11111893-313
American Historical Exposition in Madrid - p315
doi:10.1038/scientificamerican11111893-315