Slavery in New York was a New York Historical Society Exhibition in 2005-6.
New York Slavery (1 of 14 chapters – follow links) is the doctoral dissertation of Dr. Vivienne L. Kruger. MA., M. Phil., Ph.D. circa 1985. Dr. Kruger can be contacted at newyorkslavery@yahoo.com
Hat tip to Elizabeth McGrady for the Kruger find.