The Index format:
The Index format contains basically the author(s)
or editor(s) [in alphabetic order], a year [the year of
publication may be one or two years earlier], keyword(s), and the volume
and page number of the cited bibliography. Not included are: title of the
paper or book, bibliographic data for the source of the paper or book.
For most of the old bibliographies, at present only the author indices are available to us in a machine-readable version but neither the titles nor the sources of the papers. So, we think it is better to give at least the available index information than nothing at all about these papers in the ARIBIB.
For the literature before 1969, we are usually using the chapter titles of the bibliography as substitutes for individual keywords. The same is true for some of the older Astronomy and Astrophysics Abstracts (AAA) entries for which AAA has not provided individual keywords.
The Image format:
The Image format is used for the old literature from
ancient epochs until about 1880 (by
J. C. Houzeau and A. Lancaster and by
J. J. de Lalande), and for many volumes of the
Astronomischer Jahresbericht (AJB) until 1968. The Image format contains
the same information as the Index format, and provides an additional link to a
GIF image of that page of the bibliography which cites the
(Some of the links given in the Image format do not show the desired page, but only a message that this page is not accessible for external users. Then the user has to inspect a printed version of that bibliography. The information in the ARIBIB is helpful to give the volume number and the number of the page on which the corresponding paper(s) can be found.)