SCIENTIFIC AMERICAN, New York, June 3, 1893  The front cover has "World's Columbian Exposition - The Exhibit of Windmills" and "... The Palace of Agriculture" with an accompanying article.  Inside the issue is: "The World's Columbian Exposition - The Famous 999" (railroad engine); "Bacon's double Cylinder Hoisting Engine"; "Pneumatic Focusing Apparatus for Telescopes"; "The New Post Office and Court House, Baltimore" and more illustrations, articles and advertisements. 
Complete in sixteen pages, never bound, in very good condition.