US patent records in FreePatentsOnline now display titles of cited US patent documents. This is a nice improvement since it provides more information about the reference without forcing you to leave the current document. Titles of cited references available in the USPTO database nor are included on patent documents.
However, I noticed recently that some FPO records do not include all the older cited references. For example, US 3,803,463 cites 8 US patent documents, the earliest being 8,843 issued in 1852 and 644,896 from 1900. However, the FPO record for this patent displays only 6 cited patents, the earliest being 2,401,815 from 1946.
After further testing it appears that the problem is limited to pre-1976 patents.
Patent Librarian's Notebook 
Hi there,I found your blog post very interesting.i am Nick Robinson,a community member at Patents dot Com(a comprehensive free patent search engine).Will like to talk(through email) to you,is this the right time to talk about or should we talk during weekends?Regards,Nick RobinsonE-nickrbson@gmail.com