According to Acrobat, the Body is Goudy Old Style. Subheads and drop caps all appear to be Chaosium standard Hobo (its imbedded in the PDF Properties), along with a smattering of Palatino, Stone Sans, Legacy Sans, Impact, along with Wingdings and Symbol.
Now, what it doesn't tell me is sizes or leading. Chaosium has used 9/11 in the past for Body, but the BGB appears to be a bit larger, perhaps 10/11 or even 10/12.
Update: "Copy with formatting" into TextEdit says that its 10 pt, single space, which would normally be 10/12.
SDLeary