{"features":[{"geometry":{"coordinates":[[-1.7,49.7],[-1.05,49.45],[-0.35,49.35],[0.45,49.42]],"type":"LineString"},"properties":{"archive_url":"https://www.loc.gov/item/2001628569/","confidence":"archival_reference","control_point_status":"not_recorded","date":"1944-06-06","digitization_status":"reference_schematic","exactness":"reference_not_trace","geometry_status":"archival_reference_schematic","georeference_status":"not_georeferenced","id":"archival_front_normandy_1944_06_06","map_date":"1944-06-06","name":"LOC situation-map reference front - Normandy D-Day, June 6 1944","precision_policy":"frontline_precision_policy_v1","public_precision_warning":"Archival reference geometry only; georeferenced raster tracing is required before promotion.","review_status":"archival_reference","source":"loc_twelfth_army_group_item_bulge_set","summary":"Reference line tied to LOC Twelfth Army Group situation-map series. 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georeferenced raster tracing is required before promotion.","review_status":"archival_reference","source":"loc_twelfth_army_group_1944_12_11","summary":"Source-registered December 11 1944 line, useful as pre-Battle-of-the-Bulge reference.","theater":"Western Front","type":"archival_front_reference"},"type":"Feature"},{"geometry":{"coordinates":[[4.0,50.8],[5.2,50.4],[5.8,50.05],[5.7,49.75],[6.25,49.45],[7.0,48.9]],"type":"LineString"},"properties":{"archive_url":"https://www.loc.gov/collections/world-war-ii-maps-military-situation-maps-from-1944-to-1945/articles-and-essays/the-battle-of-the-bulge/","confidence":"archival_reference","control_point_status":"not_recorded","date":"1944-12-24","digitization_status":"reference_schematic","exactness":"reference_not_trace","geometry_status":"archival_reference_schematic","georeference_status":"not_georeferenced","id":"archival_front_bulge_1944_12_24","map_date":"1944-12-24","name":"LOC Battle of the Bulge reference front - December 24 1944","precision_policy":"frontline_precision_policy_v1","public_precision_warning":"Archival reference geometry only; georeferenced raster tracing is required before promotion.","review_status":"archival_reference","source":"loc_bulge_essay","summary":"Battle of the Bulge reference line linked to LOC campaign essay and situation-map collection.","theater":"Western Front","type":"archival_front_reference"},"type":"Feature"},{"geometry":{"coordinates":[[5.6,51.5],[6.5,51.0],[7.1,50.45],[7.7,50.0],[8.2,49.45]],"type":"LineString"},"properties":{"archive_url":"https://www.loc.gov/item/2004631900/","confidence":"archival_reference","control_point_status":"not_recorded","date":"1945-03-09","digitization_status":"reference_schematic","exactness":"reference_not_trace","geometry_status":"archival_reference_schematic","georeference_status":"not_georeferenced","id":"archival_front_rhine_1945_03_09","map_date":"1945-03-09","name":"LOC situation-map reference front - Rhine approach, March 9 1945","precision_policy":"frontline_precision_policy_v1","public_precision_warning":"Archival reference geometry only; georeferenced raster tracing is required before promotion.","review_status":"archival_reference","source":"loc_twelfth_army_group_1945_03_09","summary":"Source-registered March 9 1945 line near the Rhine campaign period.","theater":"Western Front","type":"archival_front_reference"},"type":"Feature"},{"geometry":{"coordinates":[[8.8,53.4],[10.2,52.8],[12.6,52.5],[13.9,52.2],[15.4,51.0],[15.0,49.0]],"type":"LineString"},"properties":{"archive_url":"https://www.trumanlibrary.gov/maps/m1785-map-european-theater","confidence":"archival_reference","control_point_status":"not_recorded","date":"1945-04-24","digitization_status":"reference_schematic","exactness":"reference_not_trace","geometry_status":"archival_reference_schematic","georeference_status":"not_georeferenced","id":"archival_front_europe_1945_04_24","map_date":"1945-04-24","name":"Truman Library Newsmap reference front - Europe, April 24 1945","precision_policy":"frontline_precision_policy_v1","public_precision_warning":"Archival reference geometry only; 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