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Credit/Permission:
Moore, C. E. & Merrill, P. W. 1968,
Partial Grotrian Diagrams of Astrophysical Interest
(Washington D.C.: Government Printing Office (GPO)) /
Believed to be in the
Public domain.
The book was published by
US Government Printing Office
without copright notice.
It is specified as a reprint of Appendix A of
CIFS: Monograph Series 610,
Merrill, P.W. 1956, Lines of the Chemical Elements in Astronomical Spectra
(Washington D.C.: Carnegie Institute of Washington).
However, a
US Copyright Office Search
shows no result under the book's title
(i.e., Moore & Merrill 1968's title)
nor under the names of authors
Charlotte E. Moore (1887--1961)
and Paul W. Merrill (1887--1961).
Image link: NED:
Partial Grotrian Diagrams of Astrophysical Interest
(see also NASA/IPAC Extragalactic Database (NED)).