The Day The Sky Fell Down, ISBN 0953450309. Not entirely easy to get hold of now, though I still see it on sale from time to time locally.

Have a look at Amazon or AbeBooks….

Guess you know this already…
http://www.pprune.org/aviation-history-nostalgia/304703-air-ferry-dc-4-crash-3-june-1967-a.html#post3899624