@NotShanalotte Yes thanks! I see the term Viosterol used which is not clear to me on D2 v D3. However based purely on the age of the study I would guess D2.
"As an inunction we made a compound of : yellow wax, 5 parts ; spermaceti, 5 parts ; viosterol in oil 250 D, 26 parts ; 5 olive oil, 10 parts, and lecithin, 0.75 parts, in a cold cream base. This mixture contained 1,800 rat units 6 of vitamin D per gram. Another compound using an irradiated mineral oil instead of viosterol was employed to determined the mechanism of the action of vitamin D by inunction. This preparation of an irradiated mineral oil is known to be a source of secondary radiation in that it is capable of fogging a photographic plate."