Add spaces: TheEditioncontainsalistandillustrationsofallassemblyunitsoftractort-4A.

Answer: The Edition contains a list and illustrations of all assembly units of tractor t-4A.

Add spaces: Theauthorityiscalled"Machabredocteur",andtheheadlineofhissecondverseis"Ledocteurencor".

Answer: The authority is called "Machabre docteur", and the headline of his second verse is "Le docteur encor".

Add spaces: AdebtthatHalmosowestovonNeumannisthatoneofhislecturecoursesinspiredHalmos'sfirstbook.

Answer:
A debt that Halmos owes to von Neumann is that one of his lecture courses inspired Halmos's first book.