Tidewater and Weather-exposure Tests on Metals Used in Aircraft (1939)
NASA Technical Reports Server (NTRS) · leaf 37
o … Figure 80- Rivets on Dowmetal M panels exposed to the weather. The AM55S rivets again show the least attack. Corrosion in general was much less severe than in the tidewater tests (fig. 7). xVfe
NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.