This is an excellent resource I stumbled across for anyone interested in early planetary images. It has a searchable database of images from several observatories around the world.
www.lesia.obspm.fr/BDIP/index.php
Its pretty amazing to see the early pics of Jupiter taken back in the 1890s as compared to now.
*Edit
For example this pic of Jupiter from 1891 clearly shows how much the GRS has shrunk