topic

• Railroad signals24
• Signal stations24
• Railroad crossings7
• Apartment houses3
• Bridges3
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name

• Sperr, Percy Loomis, 1890-196423
• New York Central Railroad Company3
• United States. Army. Signal Corps3
• Long Island Rail Road2
• Brown Brothers (New York, N.Y.)1
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collection

• Photographic views of New York City, 1870's-1970's, from the collections of the New York Public Library30

place

• Manhattan (New York, N.Y.)11
• New York10
• New York (State)10
• Staten Island (New York, N.Y.)8
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genre

division

• Milstein Division30

type

• still image30