16 PRINTED GUIDES, MAGAZINES, AND NEWSLETTERS ON THE SUBJECT OF OPTICAL OR SIGNAL PROCESSING SYSTEMS, OPTICAL COMMUNICATION SYSTEMS, OPTICAL CORRELATORS, ADAPTIVE OPTICS SYSTEMS, COMPUTER AIDED DESIGN SYSTEMS, MICROWAVE SYSTEMS, VIRTUAL REALITY SYSTEMS, ENTERTAINMENT SYSTEMS, MICROSCOPY SYSTEMS, TWO DIMENSIONAL DISPLAYS INCLUDING DIRECT VIEW AND PROJECTION SYSTEMS, THREE DIMENSIONAL DISPLAYS, STEREOSCOPIC DISPLAYS, AUTOSTEREOSCOPIC DISPLAYS, VOLUMETRIC DISPLAYS, SWEPT VOLUME DISPLAYS AND HOLOGRAPHIC SYSTEMS; PAPER ENVELOPES FOR PACKAGING ADVERTISING MATERIAL RELATING TO OPTICAL CORRELATORS, ADAPTIVE OPTICS SYSTEMS, COMPUTER AIDED DESIGN SYSTEMS, MICROWAVE SYSTEMS, VIRTUAL REALITY SYSTEMS, ENTERTAINMENT SYSTEMS, MICROSCOPY SYSTEMS, TWO DIMENSIONAL DISPLAYS INCLUDING DIRECT VIEW AND PROJECTION SYSTEMS, THREE DIMENSIONAL DISPLAYS, STEREOSCOPIC DISPLAYS, AUTOSTEREOSCOPIC DISPLAYS, VOLUMETRIC DISPLAYS, SWEPT VOLUME DISPLAYS AND HOLOGRAPHIC SYSTEMS