Thanks, Colofornian — I remember now.
Mormon Doctrine is not an official publication of the LDS church. It was written by Bruce R. McConkie before he was called to be an apostle, back in the late 1950s. The author states in the preface of the book that it is his work alone, and that he is fully responsible for it. The LDS church has never set it forward as an authoritative declaration of doctrine.
Then WHY did it receive so much attention by HEADQUARTERs if it were NOT 'official'?