This work was presented in a unified form in Topology of Manifolds (1949); this was reprinted in 1963 and again in 1979 with a few notes on the current status of the problems.
Trabaho na ito ay itinanghal sa isang pinag-isa form sa Topology ng Manifolds (1949); ito ay reprinted in 1963 at muli sa 1979 na may ilang mga tala sa kasalukuyang kalagayan ng mga problema.