books.google.com - Ian Nicolson, a professional boat designer and sail maker withover 30 years of experience, has created a book that is guaranteed to improve the abiltiy and understanding of all sailors. He has compiled over 150 practical tips with easy-to-follow instructins that cover all sail types and situations. Mainsails,...https://books.google.com/books/about/A_Sail_for_All_Seasons.html?id=nO3M-8JAhH4C&utm_source=gb-gplus-shareA Sail for All Seasons