NEW YORK — Swann Galleries’ annual Printed & Manuscript African Americana auction on March 30 was, by a wide margin, the most successful in its 28-year history. The event set records, with $1,377,463 in total sales and an even 94% sell-through rate. Eight lots hit the $50,000 mark — after only 14 lots hit that mark in the previous 27 years combined. It was the third-largest sale in the long history of the house’s book department, behind only two noted single-owner sales, the Epstein sale of 1992 and the Ford sale of 2012.