Conge's work is known internationally and he is represented in public and university collections in the United States, Europe, Japan and China including:
• Museum of Modern Art - Toyama, Japan
• Musee de la Publicite - Paris, France
• Lahti Poster Museum - Lahti, Finland
• Moravian Gallery - Brno, Czechoslovakia
• Colorado State University - Fort Collins, CO
• International Poster Museum - Warsaw, Poland
• The German Poster Museum - Essen, Germany
• Norfolk Museum of Arts and Sciences - Norfolk, VA
• State University at Cortland - Cortland, NY
• Everson Museum of Art - Syracuse, NY
• Marine Midland Trust Company - Syracuse, NY
• Mobil Chemical Corp.- New York, NY
• Syracuse University - Syracuse, NY
• University of Rochester - Rochester, NY
• Dansk Poster Museum - Aarhus, Denmark
• Colorado State University Libraries, Kluge Project, Fort Collins, CO
• University of Utah, Marriott Library, Salt Lake City, UT
• University of Connecticut, School of Fine Arts - Storrs, CT