According to Oechsner, the biggest single share of Hitler's library, some 7,000 books, was devoted to military matters, in particular "the campaigns of Napoleon, the Prussian kings; the lives of all German and Prussian potentates who ever played a military role; and books on virtually all the well-known military campaigns in recorded history." Another 1,500 volumes concerned architecture, theater, painting, and sculpture. "One book on the Spanish theater has pornographic drawings and photographs, but there is no section on pornography, as such, in Hitler's Library," Oechsner wrote. The balance of the collection consisted of clusters of books on diverse themes ranging from nutrition and health to religion and geography, with "eight hundred to a thousand books" of "simple, popular fiction, many of them pure trash in anybody's language."