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Sweet planimeter a ways down the page at https://www.flickr.com/photos/ciagov/sets/72157674852500522 https://www.flickr.com/photos/ciagov/sets/72157674852500522
by jacobolus 10y ago
Sweet planimeter a ways down the page at https://www.flickr.com/photos/ciagov/sets/72157674852500522 https://www.flickr.com/photos/ciagov/sets/72157674852500522