The ionization structure of planetary nebulae.
By: Timothy Barker
Contributors: United States. National Aeronautics and Space Administration
Series: NASA contractor report -- NASA CR-180141
Publisher: National Aeronautics and Space Administration
Published: 1986
Place of publication: [Washington, D.C; Springfield, Va. : National Technical Information Service
Language: eng
Format: Microform
Other titles: New observations of the ring nebula
Notes: Distributed to depository libraries in microfiche

Microfiche. [Washington, D.C. : National Aeronautics and Space Administration, 1987] 1 microfiche