„Percival Lowell observing Venus from the Lowell Observatory in 1914“ by Unknown – Reconstructed from several online sources by Joe Haythornthwaite. Licensed under Public domain via Wikimedia Commons.
„Percival Lowell observing Venus from the Lowell Observatory in 1914“ by Unknown – Reconstructed from several online sources by Joe Haythornthwaite. Licensed under Public domain via Wikimedia Commons.