Old Maps of Singapore
https://hm.onemap.sg/
This site provides old versions of maps published from 1954 to 2009.
At the home page, move the slider to the year of interest. If there is an edition for that year it will show a full map. If there is no edition for the year it will say so.
Click on the thumbnail for the selected map.
Alternatively click on the full map to get an enlarged version. Click on "Download all maps for this edition" to download a zip file for the year.
