CicatrixBooks distributes books written by Bille Hougart. 
Current books-in-print are:

Native American and Southwestern Silver Hallmarks (2016, 3rd edition)
ISBN 978-0-9711202-6-6
519pp, trade paperback
$49.99 retail; $30.00 wholesale
The Little Book of Mexican Silver Trade and Hallmarks (2013, 3rd edition)
ISBN 978-0-9711202-3-5
288pp, trade paperback
$30.00 retail; $18.00 wholesale

To learn more about these books and to purchase print or epub versions, 
please visit BilleHougartBooks