The Last Great Wilderness slideshow is a great example of pre-PowerPoint presentation.
"...created by a group of amateur activists in the late 1980s. The music, images, and narration are a product of their time, but the show’s message and content seem surprisingly fresh and relevant today...
...For almost two decades, Lenny Kohm took the show on the road—presenting it in libraries, church basements, university lecture halls, and other venues across the United States. On these tours, he was often joined by Gwich’in representatives who explained to grassroots audiences how drilling in the refuge would jeopardize their culture, food security, and relations with caribou and the land...
...Originally presented with two slide projectors, a fade-dissolve unit, and a sound system..."