…I realize I was over-hasty in dismissing the recent additions made since book scanning resumed earlier this month. True, many of the fine wines in the cellar are there only for the tasting, but the vintage stuff can be drunk freely, and there are already some wonderful 19th century titles, at this point mostly from Harvard. The surest way to find them is to search by date, or by title and date. Specify a date range in advanced search or simply enter, for example, “date: 1890” and a wealth of fully accessible texts comes up, any of which can be linked to from a syllabus. An astonishing resource for teachers and students.
The conclusion: Google Print really is shaping up to be a library, that is, of the world pre-1923 — the current line of demarcation between copyright and the public domain. It’s a stark reminder of how over-extended copyright is. Here’s an 1899 english printing of The Mahabharata:

A charming detail found on the following page is this old Harvard library stamp that got scanned along with the rest: