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I have the Barratt Disneyland 'True Life' set which may be the one you are referring to. It is a 60 card medium size set of still photos of wild animals. Unfortunately I do not have the ability to upload a picture for you to examine. On a personal level my favourite Barratt sets are The Secret Service and Captain Scarlett from a slightly later period.
Hoarder , don't worry your not losing your marbles , i believe crossed lines might be the problem .there is/was a set released titled ' living desert ' issued by Nabisco in 1959 .
The picture you have posted is indeed the Barratt 'True Life' set (1956) which I thought may be the one you were referring too. The trade card index code is BAR-68 and they measure 64x64 and are a numbered series of 60 cards. I hope that helps.