| Pennsylvania Visitors Network | National Stereoscopic Association |
| Stereoscopic Displays and Applications | Stereo Photography |
| Code of Ethical Principles | Meadville-Western Crawford County [Pa] Chamber of Commerce |
| A Global View Of The World With Rare Photographs & Text By The Keystone View Company |
George Eastman House |
| The Meadville Tribune | CAGLE’S ANTIQUE CORNER |
| Photographic Historical Society of New England | 3D Glasses – American Paper Optics, Paper 3D Glasses, 3-D Glasses Manufacturer 3D Glasses – We’ve manufactured over 500,000,000 paper 3D glasses, we know we can satisfy your taste for 3D. |
| Online Archive of California |
