US, uses LCSH (Library of Congress Subject headings), gives a pile of bibliographic records on the subjects listed. Index of Science Tracer Bullets Online. Listed by title (Science Tracer Bullet - Science Reference Services, Library of Congress) Found the name of it a bit suspect, though. Why do you need to call them tracer bullets, for fucks sake?

Cheers to Librarians' Index to the Internet for this one.