There are two options for the Digital TOPO:
Want the whole book?Get the whole book in one easily downloadable format from here: Southern Ontario Backroad Mapbook
Only interested in one or two maps?Get the individual TOPO PDF Maps from here: INDIVIDUAL PDF MAPS
You will need Avenza Maps app to download and view BRMB Digital Georeferenced PDF Maps:
1) Download Avenza from the App Store, Google Play or Windows Store
--Avenza allows for tracking, marking waypoints, zooming in and out, and more.
2) Launch the app on your device, locate the Avenza map store in your freshly downloaded Avenza App and search for Backroad Mapbooks.
3) Locate your desired map, make your purchase, grab your downloaded topographic map and you’re ready to go exploring!