Backcountry Pilot- Flying Adventures with Ike Russell.
Edited by Thomas Bowen, published 2002, ISBN 0-8165-2179-4

Ike Russell was a Tuscon pilot who flew a C180 back in the 1960's & 1970's.
He became the go-to guy for a lot of scientific and academic types from the nearby university when they needed to go down into Mexico-
mainly trips to the Gulf of California region on both the Sonora & Baja shorelines.
This was back in the day before drug cartel beheadings & before the Feds got so uptight about off-airport landings etc.
Very good read, a number of chapters all written by some of the folks who flew down there with Ike.