Here's the complete Ditko run on Doctor Strange that originally ran in the pages of Strange Tales + the Ditko drawn Doctor Strange X-over, in The Amazing Spider-Man Annual #2. It's all here!
Originally published in 1963 - 1966, these comics show Ditko at his most visually innovative. Great stuff!
These two books collect the Doctor Stange stories from Strange Tales #110 + #111 and #115 (the origin issue) - #146 along with the aforementioned story from the second Spidey annual (there were no Doctor Strange stories in Strange Tales #112 - #114, in case you were wondering; they didn't realize the fans would be clamoring for more!).
392 pages of classic Marvel Comics – for less!