Inside Out Library · ExploreA Study of Transparent Plastics for use on Aircraft, Special Report (1937)NASA Technical Reports Server (NTRS) · leaf 44!2« a<2 Figure 4.- Exposure panels after one year out-of-doors Uample 34 exposed for nine months only).NASA Technical Reports Server (NTRS)Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.More pictures from A Study of Transparent Plastics for use on Aircraft, Special ReportMore like this
