Norwegian friend Barre has scanned the 1948 edition of the Iraq Petroleum Company’s handbook. The section on Islam, starting here:
http://almashriq.hiof.no/lebanon/300/380/388/ipc/ipc-hb-1948/pages-html/021.html
…is probably as good a summary as you’ll find. There are overtones of Western superiority in the writing, but it’s a quick read and kinda depressing to think about the state of affairs in the world 60 years later. The second paragraph of section (e) on page 26 is particularly poignant…
http://almashriq.hiof.no/lebanon/300/380/388/ipc/ipc-hb-1948/pages-html/026.html