'Percival Lowell built an observatory in Flagstaff, Ariz. to study this planet's "canals"'
Mars
THE LOWELLS: Percival Lowell built an observatory in Flagstaff, Ariz. to study this planets canals
Percival Lowell built an observatory in Flagstaff, Ariz. to study this planet's "canals"
Percival Lowell built an observatory in Flagstaff, Ariz. to study this planet's "canals"
THE LOWELLS
Mars
THE LOWELLS