Hi, Michelle -
It's been 8 years since you posted this, so hopefully my reply reaches you.
I have a hard copy of the genealogy book you are asking about and have scanned it to a PDF file. If you send your email address to email@example.com
, I will email you a copy of the book. It is written in Norwegian but with a small bit of effort you can decipher both the format of the book and simple elements like birth and death dates. There is a great deal of information about the Krohn family.
I have also entered a great deal of information from the book (but not all of the Krohn information) into geni.com. You might want to explore that web site, as well, since it seems to be a preferred online genealogy service for many Norwegians.