I have only read the paperback version of "The Golden Bough" (700pages, Wordsworth reference series) - and it was fascinating. But I suspect it must be an abridged edition, because (according to the dreaded wiki) the original ran to 12 volumes!
It is also worth noting some criticisms. Firstly, by modern-day standards, the prose is overly embellished and highfalutin. Secondly some critics have pointed out that Frazer tends to state tenuous hypotheses and then amass miscellaneous tenuous evidence to support them. For a work of literature, this might be OK. But for a work with pretensions of being scientific, this is (arguably) "not on"!