Professional Boatbuilder Magazine in consecutive issues features Bob Johnstone's two companies. "J is for Johnstone" came first in the Dec/Jan issue. Download the issue as a PDF (28M), then go to page 28 for the article.
Also, MBI has followed up their Herreshoff Sailboats publication with the beautifully illustrated, 156 page book "J/Boats, Sailing to Success" written by Anthony Dalton. The book is available from Amazon.com.