Steve.
Not 100% sure if the books are still available but if they are you should be able to find them both on
http://www.automobilia.no/english/
I know that Nyerrøds book "En av de mange" (One out of many) should be found there at least.
This is a very very very good bookshop in Oslo. Admittedly rather pricey but the owner is in the know about just about any war- or tech book published.
Apart from that I did find the Brennpunktbookfor sale in the webshop of our Norwegian dive mag
http://shop.dykking.no/catalog/produ...products_id=28
You can also get it from the Amazon afiliate bokkilden
http://www.bokkilden.no/ProductDetai...alogName=Books
While we're at it I can't praise enough the book Flyalarm. Loads of pics and just republished. It covers the complete aerial war history over Norway and is VERY thorough. It's our bible. Once again in Norwegian though.
http://www.bokkilden.no/ProductDetai...alogName=Books
Here's the Norwegian book about the Black Friday. Very very good book with lots of nice pictures
http://www.bokkilden.no/SearchResult...n&filtertype=0
Let me know if you don't have success in finding Nyerrøds book. Vee hav our vays you know.
Kyrre