Proposals-NASA, An Extreme ultraviolet spectroheliograph for advanced orbiting solar observatory, 1965 July

Proposals-NASA, An Extreme ultraviolet spectroheliograph for advanced orbiting solar observatory, 1965 July, - 04 02 GAN 1 Sub- 4 Box 4 Folder 83, Box: 4, Folder: 83. Gordon A. Newkirk, Jr. Papers, - 04-02-GAN. National Center for Atmospheric Research (NCAR) Archives. https://aspace.archives.ucar.edu/repositories/2/archival_objects/8174 Accessed December 10, 2025.