Overview The collection consists of slides used by Dr. Dufour, including published series by NASA, various observatories, and commercial publishers, along with Dufour's slides.

Abstract: Academic and professional papers of William E. Gordon, member of the faculty of Rice University 1966-1985, now Distinguished Professor Emeritus of Space Physics and Astronomy and of Electrical and Computer Engineering, with material related to his work in developing and administering the Arecibo Ionospheric Observatory in Puerto Rico.