11. Scientific and technical aerospace reports, semi-monthly abstract journal with indexes; [prepared by Scientific and Technical Information Facility]. Bookmark SuDoc number: NAS 1.9/4: (v.nos.&nos.)
12. Scientific and technical aerospace reports, semi-monthly abstract journal with indexes; [prepared by Scientific and Technical Information Facility]. Bookmark SuDoc number: NAS 1.9/4: (v.nos.&nos.)
13. Scientific and technical aerospace reports, semi-monthly abstract journal with indexes; [prepared by Scientific and Technical Information Facility]. Bookmark SuDoc number: NAS 1.9/4: (v.nos.&nos.)