Keywords: Bladkwell House sign jeh.jpg en Looking southeast at plaque of File Blackwell House RI jeh jpg on a cloudy midday 72000862 own Jim henderson 2010-06-25 40 45 37 44 N 73 57 4 32 W alt 0_source exif_heading SE cc-zero Historical markers in New York Plaques in New York City Houses on the National Register of Historic Places in Manhattan Roosevelt Island |