American modernist art has been defined for decades by a narrow range of works by almost entirely male New York-based artists in the circles of Alfred Stieglitz and Walter Arensberg. Typically, Georgia O'Keeffe is the solitary acknowledged exception to these male-dominated modernist circles. But, as Marian Wardle and the contributors to this long-overdue collection reveal, the exceptions are far more numerous than have been credited. Contributing...