Hi from Australia!
Pat, the reference by Rosier about the cabbage compresses in Breastfeeding
Review was in (vol 1) No.12, May 1988.

Other references I have on record about cabbage leaves are:

Corrieri D "Cabbage Leaves: An Effective Treatment for Swollen Tissues"
(letter) in JHL 8(3): 126-127 September 1992

Nikodem et al "Do cabbage leaves prevent breast engorgement? A randomised,
controlled study" Birth 20: 61-64 1993 (I only have a short summary of this
article in Breastfeeding Review Vol 2(9): 438 May 1994) They couldn't find
a difference in breast engorgement, but did find those who used cabbage
leaves went on to breastfeed for longer than the control group.

Also, cabbage leaves are mentioned in a "Time Was...1904" in JHL 8(1):
33-35, under the heading of "Milk Fever". It is interesting that they were
advised way back then!

My firstborn, 10 years ago, was very sleepy for the first 3 days of life,
and wouldn't suck, hence bad engorgement. The hospital where I delivered
used cabbage leaves for engorgement, and I personally found them to be very
effective. More recently they seem to have gone out of favour, due I
believe to concerns re pesticides on vegetables, and also that they have
not been "scientifically" proven to work!

Joy Anderson