Colonel C. H. Birdseye, chief of the Division of Engraving and Printing of the U. S. Geological Survey, will give an illustrated lecture tomorrow evening on "Acrophotography in Federal Government Mapping" at the Harvard Institute of Geographical Exploration at 8 o'clock.
His talk, dealing with the proposed National Plan for completing the topographic map of the United States, will include an account of a boat trip through the Grand Canyon of the Colorado River. The public will be admitted free.
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