Thanks Francesca. As best as I can remember (and I haven't been in that area for about 10 years), Marydale Farm was right on the main road that leads to St. Francisville and west out to the river. So that probably was Route 10. I think I put everything I learned about Marydale Farm in the book, including the training of anti-Castro Cubans there, Shaw's visits there, the spotting of Lawrence Howard and Reeves Morgan being warned to forget what he saw there.
As for Ferrie at White Rock, that comes from internal LIFE Magazine telegrams, specifically from Holland McCombs who was a LIFE bigwig at the time and a close friend of Clay Shaw's. He apparently found 2 individuals who remembered Ferrie being in Dallas shortly before the assassination. Of course, Ferrie denied ever being in Dallas during that time. Also, the report never made it into any of LIFE's articles - just Garrison/Mob smear stuff.
Regards,
Bill