Where can you find pictures of the first roller coaster built?

The first known roller coaster was built in Paris in 1817 by the French inventor Louis Séguin. There should be pictures from that time. However, the oldest surviving roller coaster is the Leap-The-Dips wooden coaster at Lakemont Park in Altoona, Pennsylvania, which opened in 1902. Pictures from that roller coaster can be found on the internet.