Minor White helped to found Aperture Magazine and there is info on him in their 50th anniversary book. You might also want to go to http://www.aperture.org/ There are a fair amount of resources on him there.
Nancy Newhal, who wrote extensively on the photographers of Group f/64, wrote a book called "From Adams to Stieglitz: Pioneers of Modern Photography", in which she devotes chapters to various photographers of the early to mid-half of the 20th century. One of these chapters is dedicated to Minor White and outlines much of his career. I don't know where you looked on the web, but I know that Masters Of Photography has some good examples of his work. Well I hope this helped out.