Geyer's Stationer list update

Mike Kennedy recently brought to my attention two volumes of Geyer's Stationer not listed in our directory of issues available online: volumes 51 and 63, from 1911 and 1917. I have just updated the directory, also adding in links to the HathiTrust copies. In all cases but one, the same volumes, from the same repositories, are available through both Google Books and HathiTrust.