For the Rhodesia records there is an alphabetical index Death Index listed under Surnames under that is the Death Registers and then the first number is the volume and the second the record and if there is a second number that seems to be for the will.
So D.R. 41/33 237 would be Volume 41 and Record number 33 and 237 would be the number of the will which you will find in the Death Registers
The Death Registers contain the Death Notices which if you are lucky will give place of birth and name of parents, wife and children
The Death Notices 1904- 1976 (Separate section) and the forms are labelled Form of Information on a Death will give you cause of death and are listed under the names of towns and then by year.
LDS seem to have the names switched around.
I mentioned it as the images are free and no one knows if it will stay that way