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11. Illustrations of the process of photo-engraving, including plates, etc.; specimens of the work done in the establishment of the donors. - 63 numbers. Photo-Gravure Co., The, New York, N.Y. A photogravure plate and photogravures executed in the establishment of the donors. - 9 numbers (including series of 6 and more specimens each). Portrait Collection of the U.S. National Museum (Depositor) Engravings, mezzotints, etc. - 8 numbers. Prang, L., & Co., Roxbury, Mass. Illustrations of the processes and history of lithography and chromolithography; wood engravings; a drawing; specimens of [[etenochromy?]]. - 473 numbers. Radtke, Lauckner & Co., New York, N.Y. Proof of a dry-point by Wm. U. Lippincott published by them. Ross, Charles J., Burlington, N.J. Specimens of the papers for process - drawings made by the donor, with drawings upon them,