This link will take you to the main website of the Centennial Exhibition Digital Collection provided by the Free Library of Philadelphia: http://libwww.library.phila.gov/CenCol/index.htm
This link is found under Tours and provides a click-able map of the fairgrounds, which will then display photos taken back then of various things and exhibits: http://libwww.library.phila.gov/CenCol/tours.htm
Memorial Hall to the left is still standing today. It was recently renovated and converted to hold the Please Touch Museum, a place where kids can explore and touch tons of things we see in everyday life. You must have a child to enter.
There are so many links and sites out there on the exposition, but one I had to include was this one dedicated to Office Equipment and Supplies at the Exposition: http://www.officemuseum.com/centennial%20exposition.htm
I am an Amazon Associate.