Susan, we were given a 30 page printed guide (in Spanish... GUAI Camino Sur Huelva-Zafra) , available from the Association of Friends of the
Camino de Santiago HUELVA. Printed inside our 2011 copy, it suggests contacting Fernando Quintero, President of the Association de Amigos del
Camino de Santiago de Huelva (630250255).
There's an address and different numbers for the Editor:
Asociacion de Amigos del
Camino de Santiago de Huelva,
Casa de Galicia, Avda., Alemania, 26 bajo - 21001 - HUELVA
TEL: 959 241829 (between 6-9pm)
I'm trusting these numbers are still valid. This was the only guide book we had plus a very useful list of all accommodation details for all along the Camino del Sur to Zafra. Some of these details will have changed but hopefully there's an updated list. We contacted earlier and phoned from Huelva and one of the Amigos, a very friendly helpful man, came along to the Hotel Monte where we were staying to deliver the guides etc. There would surely be an email address now.
We had some fun and made a few mistakes translating the Spanish so that was not good, but the maps of each stage are brilliant, folksy and detailed. I could try and scan or photograph at least the maps and email them to you, Susan. The route map starts from Huelva on my guide, slightly different from Evanlow's link and map. I don't know anything about the route starting from Isla Cristina. Perhaps they link up at Trigueros.