Record Breaking Britannia Flight

Back in December 1957 whilst route proving the Britannia Turboprop El Al undertook a flight non stop from New York to Tel Aviv by flying in the jetstream and operating the aircarft under very tight criteria. These criteria were developed by El Al in what was termed “The Green Book”, the details of that flight can be seen here.. http://www.flightglobal.com/pdfarchi…0-%200013.html

The person responsible for this achievement was the Navigator JED Wiliams who later went on to found Britannia Airways.

Does anyone have any knowledge of the Green Book or its contents as this flight has always fascinated me

Thanks