[Rill System G17 5109]

RECTO

Handwritten in black ink at the top of the plate 'S

W

N about 17 miles in diameter

One of most remarkable rill-systems'

'Printed on black ink, stuck on plate in upper left corner 'ASTRONOMY'

Handwritten in black ink at bottom of plate 'Rills likeness to an inverted river-system

fractures of "faults"'

Handwritten in blue ink in the lower left corner of the plate 'G

17'

Handwritten in black ink in the lower right corner of the plate ' F109' (crossed out in pencil).

[Keywords: Astronomy, Moon, Outer space, Astronomy--Observations, Astronomy--Study and Teaching, Craters, Rills]