The Chicago World's Fair of 1893 for they preserve much of

for they preserve much of the freshness and richness of the 1543 edition

changes between 1684 and 1690

With masterful simplicity and apparent naiveté they tell of the dreamlike never-never land of childhood

books on color photos

series direct-current circuits

The Chicago World's Fair of 1893 for they preserve much ofOriginally conceived to commemorate the 400th anniversary of Columbus's discovery of America, the World's Columbian Exposition of 1893 was one of the largest (633 acres) and most influential aggregations of human talent, energy, and industry ever assembled. More than 27 million visitors entered the grounds (now Jackson Park) to marvel at the exhibits and displays housed in some 200 buildings, including those of 79 foreign governments and 38 states.