A large fold-out map, probably from the 1970s. It is basically the same in layout as the (much-simpler) map in the 1971 guidebook as seen in this photo: Jurong Bird Park map, 1971 | ZooChat
There are some obvious differences in where birds are kept - especially on the left - but I think it can't be too many years later than the 1971 map. Unfortunately it isn't dated.
On the back are information panels on selected bird species.