TOPIC SPACE EXPLORATION: Cover with handstamp of the sender: "SOUTHERN OBSERVATORY - CARNEGIE INSTITUTION - SAN LUIS - ARGENTINA", sent from the Observatory in San Luis to USA on 8/MAY/1910, franked with 12c. (4c. Centenary in strip of 3) with cancel of TRAVELING PO, on back Buenos Aires transit marks, with arrival cancel of Circleville applied on front and over the postage, very interesting!
topic space exploration Argentina |