So I'm reading along in my Metzger's Text of the New Testament (amazon.com) (I have the non-Ehrmanized 3rd edition), minding my own business (I have a growing interest in the development of printed editions of the GNT), and there it is. Page 96, footnote 1.

For a list of many of the ligatures used in incunabula, see the Style Manual of the United States Government Printing Office (Washington, 1945), pp. 316-18, or Georg F. von Ostermann, Manual of Foreign Languages (New York, 1952), pp. 105-8

I'm curious, but not curious enough to buy an edition. You can buy a copy of the 1945 edition of the Style Manual for $15 from some place called Oak Knoll Books. The USGPO web site does have the 2000 edition, but alas, it appears no ligatures are therein. I searched Google Books and found a 1973 copy, but this isn't (strangely) a full-view book.

I'm really curious to see what those ligatures look like, so if you can't help yourself and drop the $15+S&H, let me know. Heck, I'll even host images (3 pages, 3 images, right?) if you scan 'em. I'd think the book is in the public domain because it's published by the gummint, so that shouldn't be a big deal.

On other sources for ligature documentation, see previous posts here and here. I still highly recommend the book by Oikonomides, which appears to include the portion of Ostermann's 1952 work on the topic (which also appears to be a USGPO publication).