<?xml version="1.0" encoding="utf-8"?><mads xmlns="http://www.loc.gov/mads/" xmlns:mods="http://www.loc.gov/mods/v3" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.loc.gov/mads/
mads.xsd"><authority><topic authority="http://AATesaurus.cultura.gencat.cat/aat/getty_en">stereoscopes</topic></authority><related type="narrower"><topic>grand parlor stereoscopes</topic></related><related type="other"><topic>stereoscopic photographs</topic></related><related type="broader"><topic>photograph viewing equipment</topic></related><variant type="other"><topic>stereo viewer</topic></variant><variant type="other"><topic>stereoscope</topic></variant> <note xml:lang="en"><![CDATA[ Viewers in which pairs of stereoscopic images are mounted and appear as a single, three-dimensional image when viewed. Use for objects designed to view individual stereo cards, usually photographic prints. For the devices used to view wheels of mounted transparencies, marketed as a children's toy from the mid-20th century, use "stereoviewers." ]]></note></mads>