[2] Historians believe he was an integral part of the Slatters' interstate trading operation between Baltimore, Maryland and the New Orleans slave market.

[4] In April 1845, Henry Slatter sold 15 people (Daniel Powell, James Seafus, Gabriel Lee, Alexander Young, Sylvester Miller, Dick Bell, Robert Spriggs, William Johnston, John King, John Williams, Mordicai Jordon, Brish Barnes, Mathilda Hampton, and Mary Dorsey) to Mrs. Helene A. Olivier Reggio in New Orleans.

[8]Henry Slatter was listed as a negro trader in the 1846 New Orleans city directory, working at the corner of Esplanade and Moreau.

[9] In October 1846, H. F. Slatter of 56 Esplanade in New Orleans advertised a horse, buggy, and harness, offered for sale "on account of departure.

"[10] From January 1847[11] to June 1847,[12] H. F. Slatter ran a "Cash for Five Hundred Negroes" in Baltimore papers that was later noticed in abolitionist William I. Bowditch's Slavery and the Constitution book of 1849.