Sixth Avenue El at 23rd Street, looking south along the west side of the street.
- Early 20th century, before 1939
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- "Sixth Avenue El at 23rd Street, looking south along the west side of the street." Village Preservation (GVSHP) Image Archive, accessed Oct 21, 2020, https://www.villagepreservation.org/ia_image/sixth-avenue-el-at-23rd-street-looking-south-along-the-west-side-of-the-street/.