Researching the rivers of Johannesburg - Assistance needed

My name is  Aimée. I am currently trying to do some research on the rivers in Johannesburg. I am trying to find 2 things.

• A map with the rivers and their tributaries that run through greater Johannesburg
• Perhaps a copy of the book "The North Flowing Rivers of the Central Witwatersrand".

I would be very grateful with assistance or advice on either. Thank you so much in advance

aimeebarnes101@gmail.com