Rotary Campground - Care to Guess the Year?

I was at Al's News and saw some old post cards.  They look like they are from the 70's or 80's,  maybe 60's.   The text on the rear says "Rotary Campsite, Grande Prairie, Alberta.  Once of the Provinces finest  camspites, complete with showers amd barbecue pits to make summer outings more enjoyable.  Majestic Trumpeter Swans, which nest on waters at the site, are quite tame and sometimes accept donations of food from little visitors".   You can see some swans past the kids in the picture.   The card is on sale at Al's News for 65 cents.