Patruus:
Conspicuous by its absence from this index is the Key to Colebourn’s “Latin Sentence and Idiom” - another example of a textbook that’s in print but the Key’s gone MIA, though WorldCat has an entry for it
Following your WorldCat tip, I got my Stockholm library to loan it from a US library and it’s now a scanned and printed-out heap of 46 sheets which I plan to take the liberty of mailing to you tomorrow. Just in case you are still in your charitable Omnipage Pro / uploading mode. 
Cheers,
Int
Wonderful! The textbook seems to be pitched at about the same level as North & Hillard, with plenty of exercises but much more explanation. It’s only the absence of the Key which has deterred me from using it.
Patruus
The Colebourn key is now posted here:
http://cid-7c51d883593d5954.skydrive.live.com/self.aspx/LATCOMP/ColebournKey.pdf
The textbook itself is purchasable at the usual places, e.g.: http://tinyurl.com/3w8kba
Patruus
This is a very old thread, but it mentions the difficulties of finding an answer key to Elementary Greek Exercices by Hillard and Botting. I’ve just published the key, and it should appear on the booksellers’ websites in a few days. The ISBN is 978-981-11-5005-0, and the title is simply: “Key to Hillard and Botting’s Elementary Greek Exercises.”
The book is published under a Creative Commons non-commercial license, and I’ve emailed a PDF to Jeff Tirey, who I hope will find a place for it on this site.
Best wishes
Nigel