marvel.loc.gov The Library of Congress runs several online "galleries" of images from exhibits at the library. Many of these pictures, in GIF or JPEG format, are HUGE, so be careful what you get first. Exhibits include works of art from the Vatican, copies of once secret Soviet documents and pictures of artifacts related to Columbus's 1492 voyage. At the main menu, select 2 and then "Exhibits."
galaxy.ucr.edu The California Museum of Photography maintains its own online galery here. At the main menu, select "Campus Events," then "California Museum of Photography," then "Network Ex- hibitions."
ASTRONOMY
cast0.ast.cam.ac.uk A gopher devoted to astronomy, run by the Institute of Astronomy and the Royal Greenwich Observatory, Cambridge, England.
CENSUS
bigcat.missouri.edu You'll find detailed federal census data for communities of more than 10,000 people, as well as for states and counties here. At the main menu, select "Reference and Information Center," then "United States and Missouri Census Information" and "United States Census."
COMPUTERS
wuarchive.wustl.edu Dozens of directories with software for all sorts of computers. Most programs have to be "un-compressed" before you can use them.
sumex-aim.stanford.edu A similar type of system, with the emphasis on Macintosh programs and files.