400 1 _
‡a
Atkin, J. Myron.
‡t
University of Illinois astronomy program (Series)
410 2 _
‡a
University of Illinois (Urbana-Champaign campus).
‡b
Elementary-School Science Project.
‡t
University of Illinois astronomy program (Series)
400 1 _
‡a
Wyatt, Stanley P.
‡t
University of Illinois astronomy program (Series)