To return to the original question, the three records cited with period in 300 were created last year, presumably as AACR2 records, and recently had $e rda added to the 040. However, they lack other signs of RDA records, such as 33X fields or abbreviations spelled out, and in some cases, "i" in Desc.
----------------------------------------------------------- John Hostage Authorities and Database Integrity Librarian Langdell Hall host...@law.harvard.edu Harvard Law School Library +(1)(617) 495-3974 (voice) Cambridge, MA 02138 +(1)(617) 496-4409 (fax) http://www.law.harvard.edu/library/ All that having been said, in many many many LC RDA records, the 300 $c does not end in a period. In many others, it does. Any clue as to why some lack the period? For some examples, see OCLC #'s 677981165, 449856066, and 587078028 (lacking period); and 308173544, 297147712, and 468854226 (with period).
