Letter, possibly a copy, from John Saffin, John Usher, Edward Shippen, James Wetcombe, and Andrew Belcher to shipmaster William Welstead, 12 June 1681.  The writers, a group of Boston merchants, ask Captain Welstead to intercept a ship they had sent out the previous year to west Africa to capture people to sell into slavery, and to direct the ship to Nantasket to offload the human cargo.