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Letter from F. Wagner Schlesinger, Director of the Adler Planetarium to K.A. Bauer, Carl Zeiss, Inc.

Letter from F. Wagner Schlesinger, Director of the Adler Planetarium to K.A. Bauer, Carl Zeiss, Inc.

Letter from F. Wagner Schlesinger, Director of the Adler Planetarium to R.G. Olt, Optron Laboratory

Letter from F. Wagner Schlesinger, Director of the Adler Planetarium to R.G. Olt, Optron Laboratory

Letter from F. Wagner Schlesinger, Director of the Adler Planetarium to K.A. Bauer, Carl Zeiss, Inc.