Plantin's collection of original Garamond punches and matrices survives at the Plantin-Moretus Museum in Antwerp, together with many other typefaces collected by Plantin from other typefounders of the period.  The collection has been used extensively for research, for example by historians Harry Carter and Hendrik Vervliet.  Carter's son Matthew would later describe his research as helping to demonstrate "that the finest collection of printing types made in typography's golden age was in perfect condition (some muddle aside) [along with] Plantin's accounts and inventories which names the cutters of his types."  Plantin also commissioned punchcutter Robert Granjon to create alternate characters for three Garamond fonts with shortened ascenders and descenders to allow tighter linespacing. 
Always allow at least one extra line of space above subheadings, and preferably below as well. Without this extra space, it is sometimes difficult to distinguish headings from text. A heading must never appear alone at the bottom of a page (a “widow”) without at least two lines of text under it. Also keep in mind the conventional wisdom that a unit cannot be divided into a single part, or “you can’t have an A without a B.” If you have only one second-level heading under a given first-level heading, you should probably incorporate it into the text or, if subdivision is really called for, create another second-level heading. Addition- ally, if you have only one appendix, call it simply Appendix, not Appendix A.