The book, Sourdough Sky: A Pictorial History Of Flights And Flyers In The Bush Country represents one of the best books written about bush pilots who flew in the Alaskan territory from 1913 up through 1943.  Beyond covering the stories of behind the early flying in the Alaskan Territory, "Sourdough Sky: A Pictorial History Of Flights And Flyers In The Bush Country" lays out in detail the development of commercial flying in the North, the work of the flying missionaries, the military with Col. "Hap" Arnold and chronicles some of the more noteworthy aviation crashes including the one that killed the author's father, Steve Mills. This book ends with a salute to all Alaskan airmen of this period.  When one considers that these early bush pilots regularly flew in treacherous weather conditions, often without maps and radios, it is miraculous that any of them survived their dangerous occupation.  For those aviators who did cheat death their survival was as much proper preparation as it was the hands of fate.  A story revealed in the foreword is worth highlighting in that it relates just one experience of one bush pilot who found himself at a primitive location in a sub-zero setting.  Having just flown from Fairbanks 300 miles north to a remote location to pickup a passenger, the aviator found that the temperature had plummeted to around 61 degrees below zero.  Being a prudent individual, the pilot decided to wait until the next day to see if the weather conditions had improved.  Having found the next day that the temperature had fallen to 65 degrees below zero, the pilot was inclined to wait yet another day to see if the weather conditions would improve.  Eventually, however, he allowed the passenger to badger the pilot into flying him back to Fairbanks.  After having heated the oil in the airplane to 120 degrees, the piloted loaded his passenger and took-off into the frozen expanse that is Alaska.  As the Aircraft plodded along the oil temperature began falling to the point that the pilot felt this may be his last flight.  Fortunately the oil temperature leveled off and the flight continued.  As the pilot approached Fairbanks it was totally fogged in and it was only a bit of luck that allowed him to at the last minute spot an open patch of ground where he could land.  While this pilot found it a stroke of luck that he was able to land without incident he realized that if continued to fly in such weather conditions, it was only a matter of time before his luck would run out.  The point of this story is that early aviation in the Alaskan Territory was a very hazardous occupation in which many aviators crashed and died.  Yet despite the obvious dangers, most contined to fly and through their perseverance built the foundation for modern commercial aviation in the Alaska.  The major sections of "Sourdough Sky: A Pictorial History Of Flights And Flyers In The Bush Country" are as follows: 1) Dedication; 2) Foreword; 3) Acknowledgements; 4) Early Birds Open Alaska Interior; 5) New Planes Establish New Horizons; 6) Flights During Freeze-Up And Thaw; 7) Mercy Flights; 8) Crashes & Searches; 9) Ingenuity, Innovation And Skill; 10) Politics By Plane; 11) Hap Arnold's B-10's; 12) Barnstorming vs. CAA Regulations; 13) Wiley Post...The Lindberghs...Howard Hughes; 14) A Fallen Star; 15) Yesterday's Pioneers, Today's Air Giants; 16) Alaska's 100 Airmen and 17) Index.  In addition to an informative narrative, "Sourdough Sky: A Pictorial History Of Flights And Flyers In The Bush Country" includes the following features: 1) Approximately 267 vintage black and white photographs; 2) 1 black and white illustration and 3) 3 maps.  This book is 176 pages and is in excellent condition.  The authors are Stephen E. Mills and James W. Phillips with Noel Wien (foreword).  Edition published in 1960.