I got them onto my Mac and into Garmin Base Camp then to the nuvi. Took a lot of trial-and-error, but here's what I did:
1. Downloaded the text version.
2. Opened the file in a spreadsheet and rearranged them to lat, lon, alt (=0), and name (= page number - tract number). Headers for columns = latitude, longitude, altitude, name. Save as CSV file.
3. GPSVisualizer.com will convert that to a .GPX file.
4. Imported GPX file into Base Camp and then pushed to GPS.
5. Bloated the GPS up, and was hard to find the WIHA so I deleted them and now use the Atlas