Mediatrix Press has republished Juniper Carol's seminal three-volume
work on Mariology:
As perhaps the leading Latter-day Saint apologist and scholar on the
concept of Mariology (see, for e.g., my book Behold
the Mother of My Lord: Towards a Mormon Mariology [2017]), I can personally
vouch for the series (I myself just ordered vol 2 as I have been trying to find
a “print” copy for a while now).