Ironically I was recently made aware of one as of yesterday by another breeder who feels people should know this stuff off the top of their head BEFORE they breed. (I don't fully agree with that...I honestly couldn't tell you the exact day of gestation that their eyes develop
) Keep in mind, it was originally written in 1996 and the info used was from books from the 80's and enen 70s
, so you may want to find something that is keeping up with the times. Maybe your vet could point you in the right direction to find some more recent info?
http://www.k9web.com/dog-faqs/medical/whelping.html