The history of Friends of Haslam Park
Preston Digital Archive has some great photos of the park in the past.
Another album of older photos on Flickr.
See our maps page for historic maps.
Historic England has an entry for Haslam Park which includes some early history of it's development.
Visit Preston also has a short history of the park.
There is a plan of Mawson's amended 1912 design on flickr.