Stereoscopic Mapping
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✎ Suggest a correctionHow government contour maps are made by aerial photography, checked or pivoted upon reference points established in the old-fashioned "hard" way.
Sources
- Bell & Howell Filmosound Library Catalog of Educational Motion Pictures, 1942 — title, creator, length, format, color, sound, genre, description
Record added 2026-09-26 21:16:36 · Suggest a correction