Our contribution to #ArchivesYouAreHere is the Atlas photographique de la lune by Loewy and Puiseux, 1896-1910.

At 33 inches by 25 inches and weighing more than 50 pounds, this lunar atlas is the largest book in the Archives and Special Collection at USD. The moon was photographed through the Observatory of Paris’ telescope in the late 1890s, and the photographs used to produce photogravure plates for the atlas.

Library of Congress sponsors #ArchivesHashtagParty once a month, and March’s topic is #ArchivesYouAreHere. LOC invited groups to share their maps, astrolabes, star charts, tidal maps, compasses, globes, visitor guides, treasure maps, city plans, or even architectural drawings.