Information from the Catalogue of Star Clusters and Associations (Alter et al. 1970) and its first supplement (Ruprecht et al. 1981), available on tape, has been included for NGC, IC and anon clusters. The catalogue has been separated into smaller files, one for each cluster, which bears the name bdp.cat.
The command bdp offers a few options to select information from the Budapest bibliographic catalogue for one or several consecutive years with the options -eq, -gt -lt and -i, according to an author's name or a given topic (option -s). The abbreviating system is complex within this catalogue. The abbreviations for the subjects, the journals and publications are described in the hypertext presentation of he bibliography.
> ngc 0129 move to NGC 129. Notice the leading 0
> bdp list the complete file
> bdp tr16 lists the bibliography for the cluster Trumpler 16. Can be called from anywhere in the database, for any cluster, even for those which do not have their own directory.
> bdp -eq 1970 Select the references for 1970
> bdp -gt 1960 produce a listing of all references published later than 1960
> bdp -i 1950 1960 list the references for the interval given.
The option -s is used to make selections on:
> bdp -s Trumpler a name (case is not important)
> bdp -s cepheids a subject