sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:A_guide_to_the_western_Alps_(IA_guidetowesternal00ball_0).pdf...
sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:A_guide_to_the_Western_Alps_(IA_guidetowesternal00ball_1).pdf...
sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:A_guide_to_the_western_Alps_(IA_guidetowesternal00ball).pdf...