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Photocopying undertaken by staff only. Limited to twenty exposures of stable, unbound material per day. (Researchers may not accrue unused copy amounts from previous days.) This collection is owned by the New-York Historical Society. The copyright law of the United States governs the making of photocopies and protects unpublished materials as well as published materials. Unpublished materials created before January 1, 1978 cannot be quoted in publication without permission of the copyright holder.