Until then, please visit theboswelllegacy.com, a wonderful website dedicated to The Boswell Sisters, created by Kyla Titus, Helvetia (Vet) Boswell's granddaughter. Kyla is the storyteller and caretaker of the Boswell family archives.
Also, check out "The Boswell Legacy" Book, available at The Boswell Sisters Store on eBay and Amazon.com.
