Generally speaking, search for proceedings in our Discovery Search box (located under the heading: "WHAT ARE YOU LOOKING FOR?") on our library homepage by performing an Author search of the sponsoring organization and then browsing through those results or by performing an Advanced Search with the organization as Author and the word 'proceeding*' or 'proceeding' as a keyword. If you know the name of the conference, try also a Title search or a Keyword search using significant words from the conference name.
See also the library's reference sheets for information related to these organizations: AIAA, ASCE, ASME, ASTM, MSDS, NACA, NASA, SAE.