Unlike the friendly, conversational tone of Munkres (which is the standard for most undergrads), Dugundji assumes you are an adult. The PDF opens not with hand-holding, but with a brisk introduction to classes and proper classes —a nod to the Kelley/Mac Lane school of thought. If you are expecting colorful diagrams every other page, you will be disappointed. The diagrams here are sparse, functional, and almost primitive in the scanned copy.
If you find the PDF, print out Chapter 10 (Homotopy). Read it in a coffee shop. Watch people stare as you mutter "Simply connected" under your breath. That is the Dugundji experience. Topology -Dugundji-.pdf
The keyword itself is interesting. Notice the hyphenated "-Dugundji-" and the explicit ".pdf". This suggests: Unlike the friendly, conversational tone of Munkres (which