Since 1875, Frederick Field’s edition of Origen’s Hexapla has been the standard reference for the work. A new edition is in preparation under the auspices of the Hexapla Project. But, for the present, Field’s work remains an invaluable resource. His two-volume edition is available via Internet Archive.
The second English edition of Wilhelm Gesenius’s Hebrew Grammar (ed., E. Kautzsch, trans. A. Cowley) is based on the 28th edition of the German text. I recently came across a curiosity in the English text that made me want to have a look at the German behind it. Thankfully, Internet Archive has several versions of Gesenius-Kautzsch, and at least one of these is of the grammar’s 28th edition.