Description: Cover page for the web site,
pittsburgh (1860) friends of the zeiss (1) people's planetarium and observatory (1) the buhl planetarium and institute of popular science (1) pennsylvania u.s.a. (1) zeiss ii planetarium projector (1) 10-inch siderostat refractor telescope (1) mercator's projection map of the world (1) the rise of steel technology mural by nat youngblood commissione (1)